Ya but we are not in a position of power, we have a lot of picks and we want a qb, all the other teams know this. If they really like a guy at 2,3,4 they are going to want to get compensated, likely a lot more than the "value charts"
The Giants and the Colts may not be willing to trade down. They may like a player there that they want to draft such as chub or Fitzpatrick or Chubb or Fitzpatrick or Barkley so if they don't want to trade down with the bills why would they trade down with another team?