The problem with the trade is that your likely settling for a QB that isn't a fit for you at 11. Much like Jones falling to the Pats at 15. As much as I'd love to add Jefferson, you'd be hamstringing the Pats at QB. I don't want the Pats to be in a situation again like they were with Jones. Though part of that was McDaniels not sticking around longer, I admit.
I think that, if they trade down to 11, I'd much rather grab Odunze or Nabers or an OT or possibly trade down than grabbiing a QB that you aren't sold on. Looking at a QB later on whom doesn't have the huge financial investment that you can move on from after 2 years if he's not working out with MINIMAL financial pain would be more beneficial than sinking numerous 1st round picks into a position the way that the Bills and Jets had to.