I 100% understand that point. I'm just saying that it has nothing to do with investing "more picks" and what people are really saying is just don't draft Tua at all, but don't realize it. It has nothing to do with where.
One could make the same exact argument and say that drafting him at 5 is too much of a risk when we could trade down to 8, draft him there, and pick up additional picks.
I'm fully aware that those who understand opportunity cost will know where I'm coming from and those who don't, won't. I'm fine with that.
For those who are not comfortable drafting Tua because of his medical history that's completely ok, but if someone is worth taking at 5 then they're worth taking at 3 regardless of the loss of picks since we're talking about a QB here, not a nickel corner.