I'm giving this a shot but basically, Madden does not look "inside" your Madden Gamesave for a Draft Class.
Madden looks inside your NCAA Gamesave for a Draft Class... as such, you need to operate one level higher and copy his whole gamesave and resign/rehash both.
I will let you know how it works for me, but I have a NCAA 12 Gamesave (I just needed his draft classes, not his whole gamesave) so you need to try this for yourself. Good luck!
