Then you still get one of the big four at pick number five.
The bills didn't put their hair in a ponytail to go home alone. They moved to up 12 for a reason, they have been heavily discussed in moving up.
If you get locked out at five there is, again as aforementioned you'll still get one of the big four.
I understand the ideology behind the fear of getting stuck at five, however, much like the Jets trading to three above us, you cant continuously allow teams to leapfrog you and shut you out.
Moreover, if the Giants do pass on a QB, as the other poster described above, the Denver 5th overall pricetag then skyrockets. The Giants also stand to reason that at five they can still get one of Chubb, or Barkley, or Nelson, or heck, maybe the QB that trickles down could be the guy they want and snatch him up. Either way two to five is not a bad move for the giants by any stretch.
You need to be ahead of the game here. Go get the fifth overall.