I don't know which qb's the Bills value or want. They have (hopefully) many skilled football people who know far more than me. I do know, however, what Mcbean says and does.
1. The NFL is a quarterback driven league. Just look at rules and rule changes over the years, to say nothing of league standings.
2. You can win with a mid-level qb, just not consistently.
3. Mcbean has said the Bills want to be long term consistent winners.
4. To be long term consistent winners , you need a stud qb (a consensus consistent top 10 qb). I'm pretty sure Mcbean didn't get to where they are without knowing this.
5. You can get a qb through trade, FA, or the draft.
6. Chance of stud qb through trade or FA is low. I know-Brees, maybe Cousins. But true stud qbs are rare by this route. If you are a gm, and have your stud, you are not going to trade him, or let him go FA, (unless you screw up like the redskins-and even there, not sure cousins is your stud).
7. Draft- you can go for a day one starter (extremely rare) or go for qb with a high ceiling who will probably need to sit behind a bridge qb for awhile.
8. The Bills just traded TT (truly the definition of a bridge qb who is serviceable while you are rebuilding your team and letting your high ceiling draft pick, Josh Allen, Lamar Jackson, etc sit and learn) They are going for a day one starter. If not, they would have kept TT.
9. only possible day one starters are Rosen, Mayfield, maybe Darnold
10. The draft- Browns just got their bridge qb, if they go qb at 1 or 4, probably go Darnold or Allen
Giants don't have to go qb, have lots of holes, could definitely trade down
Colts Possible trade down if Luck is ok, qb if they doubt Luck
Browns
Broncos are in win now situation, probably don't draft a qb, go with the best established vet they can put on the field today
11. The bills will trade up to #1,2,or 3 if they feel Rosen, Mayfield or Darnold is a day one starter
12. Most likely trade partner is giants where Beane knows and presumably trusts their gm and vice versa. (my guess is the deal is already in place).
13. All this is predicated on the Bills feeling Rosen or Mayfield is a day one starter. They haven't been collecting draft choices since they got here to pick a game-changing DT or linebacker. They're nice but don't win championships . They're here to get a long term stud QB. They may hit, they may miss, but look at their words and actions.