I think everyone is talking past each other a little bit, rather than talking
with each other. May I offer a couple thoughts to consider?
Lincoln Cents have a staggering number of double die obverses, double die reverses, and repunched mint marks. New examples are still being discovered fairly regularly. There are several things to ponder here.
First, the four major sources of information are Variety Vista, Copper Coins, Wexler, and the Cherrypicker's Guide. ALL of these sources have benefits, but ALL are limited. There is no single source with all the answers for most dates and mints.
Examples:

The Cherrypicker's Guide only lists a few coins from any given year. In some cases, there are well over a hundred additional varieties for that date and mint.

Major varieties similar to the Cherrypicker's Guide selections exist on the other three sites, but lack the popular recognition because they aren't included in the Guide.

For some dates, there is one significant marker to identify coins, but it isn't pictured on some or all of the sites. The big marker for 1936 cents is the "R" of LIBERTY, which can be complete, broken, or rehubbed. Most of the sites don't mention the "R" for varieties other than the three Cherrypicker's Guide, yet there are broken "R" varieties in that group. The big marker for 1941 cents is the second "T" in TRUST. It can be normal (no doubling), doubled intact over broken, doubled broken over intact, or doubled broken over broken. I haven't seen one doubled intact over intact yet, but it wouldn't be a surprising find. Many of the listings omit a photo of the second "T."
Second, none of the major sources have the most important photos: whole obverse and whole reverse photos. This obsession with closeup photos is nice for what closeup photos can do, but stifles the ability to recognize other aspects of a coin that may be important.
Examples:

Two varieties of 1934 cents have prominent die cracks that are not mentioned in any of the sources. These are actually the best first-look pickup for the varieties.

Several dates have varieties with prominent die polishing in areas not affecting the doubling. This polishing is an excellent unaided-eye pickup, but if not mentioned in any of the sources.
Third, all of the major sources love early stage and higher grade coins. Unfortunately, that's not what they look like in average circulated condition from bags or rolls.
Examples:

Bright, shiny die scratches in EDS sometimes look like a string of pearls in MDS and a series of dots in LDS.

Die cracks progress, and may be excellent unaided-eye markers in later die states. Die cracks also can be polished into oblivion or worn into invisibility.
Fourth, all of the major sources have incorrect cross-reference information, and this is more common than any of us would like to hope for.

Tip: before searching any date, create a complete and accurate cross-reference list for all DDOs and all DDRs for that date and mint. It's a pain, but it will save endless frustration later.
Fifth, most of the earlier listings focus on the particular side of the coin at issue, and disregard markers on the pother side that might be helpful. The more recent listings are correcting that problem, but fixing the older listings will take time.
Sixth, just because it isn't listed doesn't mean it isn't a
DDO,
DDR, or RPM. It can be a new variety.
I'm in the middle of going through a small mountain of 1941 cents right now. There are 30 DDOs on Variety Vista, an additional; 32 DDOs on Copper Coins that are not listed on Variety Vista, and an additional 18 on Wexler's site that don't have photos uploaded yet and may or may not be cross-listed on Variety Vista or Copper Coins. Only 3 are listed in Cherrypicker's Guide. Variety Vista lists 8 DDRs, Copper Coins adds another 8 that aren't on Variety Vista, and Wexler adds 11, but doesn't have photos uploaded yet for 10 of them, and they may or may not be cross-listed on Variety Vista or Copper Coins. None are listed in the Cherrypicker's Guide.
This pattern is duplicated throughout the entire
Lincoln Cent series.
After enough time with just one date and mint, sorting the coins gets easier. With the 1936 cents, I look for the the rehubbed "R" in LIBERTY and know immediately that is has to be one of the "Big Three." I worry about which one later. I then look for the broken "R" variety, and know that about 1 in 4 will be a
DDO. I then look for thick dates, and know these will be DDOs, and worry about which one later. I then look for any doubling on LIBERTY and the motto, and pull those aside for attribution later. Then it gets weird, and I stare into Lincoln's eyelid for a couple days, and pull those aside. Finally, I make a pass to look for the thick lettering and distended dots that are the telltale signs of DDRs. When all that's done, I make a final pass to look for errors, such as laminations, die chips,
Cuds, RCD's, and the rest. Then I roll up the shrapnel to make it go away, and go back and try to attribute the ones I have pulled aside. I use cheat sheets with the same marker for every variety, and that helps. And after all that, I still have a small pile of coins showing minor doubling that don't plainly match any known variety. I could well be missing a pickup and not attributing correctly. Or they could be a different stage than the photos and be missed. Or I could be seeing things (goodness knows, after staring at bronze eyeballs all day, that's possible). Or the coin could have too much circulation damage to spot the useful markers. Or it could be something new.
Here is my suggestion. It and 50 cents may buy a half cup of day old gas station coffee. If the threads show just ONE coin, with full obverse and full reverse photos and the key marker or markers for the date and mint, it will be easier for everyone to match those with the possible listing. If is doesn't readily match that listing, additional photos could be requested or it may be possible for other to match the coin with other listings. That would be one way we can all get on the same page, try to help each other, and provide threads that might be helpful down the road.
Let me close with this. I really appreciate
all of the people on here. I learn from
every person. What we have in common is more important than anything else. Let's help and support each other.
OK, now I've used a whole day's worth of talking here, so I'll go back to being my introverted self for a while.