Eli beat Brady/Belichick 2x, when they were at their peak. That's going to count for more since he's a Manning too.
If the Rams win the SB one more time with Stafford and he adds MVP/1st-Team All Pro? He's a first or second ballot guy. It's weird because he will have a great career on paper but never seemed like a guy where you say "the story of the NFL cannot be told without him."
Flacco would be an interesting case if he had another ring. Russ would be in with another ring.
Mahomes is already in, first ballot.
Allen will get in based on current trajectory but how long he waits will depend on the hardware he collects. Lamar Jackson is in the same boat.
Burrow needs to avoid injury and stack some seasons. He has HOF talent but is nowhere close as of today.
After that, you got the Hurts/Goff/Purdy/Dak etc., guys who need multiple rings. Hurts has one, but likely needs at least one more and about 8+ more years of good to great production. Goff and Dak are getting close on the stats side but need hardware to actually make a case.