All the draft talk is that the Giants and Raiders will both want to take QBs if they are 1 and 2. They definitely both need a QB, but I have no idea how much truth there is in the current talk. If the Pats stay at 3, there is a good chance Hunter is available.
If I was the Giants or Raiders, and I like the top 2 QBs, I would not try to get cute, I would just take a QB. Historically, there can be a trade market if the target is a QB, but less so for any other position. I would not expect teams to offer big deals to move up for a WR, like you have seen in the past for teams to move up for a QB. But you never know.
For the Pats, if Hunter is available, I would take him. If not, take the best tackle available and move on.