Well, first let me clarify that I don't think Danny ever said they need to go big, he just said that their biggest need is up front...but in the past Danny has been pretty clear that he doesn't like to use the draft to fill holes in the rotation.
But anyways, that wouldn't completely shock me, if Danny really likes Jimmer that much. I just wouldn't count on it.
For one thing, I am not sure Bradley gets him up high enough to get Jimmer. But I also question whether Danny like Jimmer as much as everyone speculates he does.
Danny loves skilled players, but earlier in the draft, we have seen that he also loves athletes. If Danny did trade up, I think it would be more likely for a guy like Chris Singleton, or Keneth Faried.