I may be mistaken, but I believe we can't have any 1st Rder PERIOD, which would make this entire hypothetical exercise irrelevant.
Even if that is not the case, I remember all the Ryan Mallet trade packages dreamed up right here 2 offseasons ago, including the ridiculous notions of getting the #1 overall.
If they were able to find a trade partner for Grapes I don't believe it would be for anything higher than a late 2nd. If the scenario was Jimmy for #63 and, say, a 5th like this year or next that would sound a little more rational. Posters here really seem to overestimate the actual value of our roster IMHO.