I doubt he will sign. He has another year and could move up alot higher than round 43. It's not as if he would be sacrficing a big signing bonus going that late. No one can know for sure, but my bet would be he comes back.
My understanding is that he is a "draft and follow" guy.
That's actually not correct. To be a draft and follow guy, the player must be enrolled in a JC or community college. Once Stewart starts classes in the fall (if he doesn't sign), he's back into the draft pool for next season.