IMHO, I feel that the current Bill's brain trust will be investing in a seasoned QB. Having said that, they will then be free to attack the front seven as you say. Mc D. seems to like draft capital, so I see some sliding down on day 2 for future picks.
If for some reason we don't sign a veteran starter at the QB position, then I think that they will entertain a move up in the 1st round. I'm betting on the 1st scenario where we have a QB signed & we devote day one to the front seven. Three out of four of the teams still alive have middle of the pack QB's. They also have four of the best D's in the league.