This isn't a top heavy draft. By your logic, if the most likely scenario of Ward/Hunter/Carter going top 3 plays out, nobody should pick at 4 because there's questions about anybody that is projected next. But somebody will have to pick at 4 and any team we try to trade with will low ball us for the exact same reason we would try to trade down.
You do not approach a draft in the context of every other draft in history. You see what the board is and approach it for what it is. If this was last year, the 4 pick would be double or triple the value it is this year because the team trading for it is getting either a top ranked QB OR a generational WR/OT prospect. This year they aren't.
So you are either picking somebody or trading down, losing them, settling for another guy in the top 10 that has question marks, and not getting any impressive return (maybe an extra 2nd).