How come he wasn't motivated the last 2-3 chances he got from Miami?
Who knows, well have to wait till the season to see how motivated he is, but if I had to answer your question I would guess he has alot more respect for Parcells than the other two clowns that were here. (but remember in 2005 - He was productive).
IMO however, we have all heard this song and dance before from Ricky sources so Its just another wait and see scenario.