As I've posted earlier in this thread, if the coaching staff can clean up some technical issues with Spriggs he should turn into an above average tackle. Don't see him as a guard though.
I don't either, Cap, but nice to know he can legitimately line up there if needed.
I'm big on versatility; Olinemen who can play more than one position, defensive players who can be moved around to create matchup problems for opponents, etc..