Broncos fan here, I was rooting for the loss because they need to start over.
I can't imagine the Bills wanting a lot from the Broncos. The best I can see would be Josey Jewell if Milano is out a while.
I think these Broncos have value on the market (I don't think they trade PS2):
-Sutton (contract isn't great, would need to be to team with injury)
-Juedy? (hasn't been great but on rookie contract still)
-Garrett Bolles (mediocre LT, would need to be injury replacement)
-Ben Powers
-McGlinchey?
-DJ Jones
-Josey Jewell
-Justin Simmons (young, good safety but has been part of losing here too long)
-Kareem Jackson
-Russell Wilson (contract is biggest issue, Broncos need to eat salary, maybe restructure and pay as bonus)
I think those guys are all vets and/or have been part of losing too long here. Or they block development of younger people behind them.
I don't know who the Bills would want (I don't know the team that well), that is a different question. But I think those are the guys who would be available to contenders needing to fill a hole.