Personally, I don't think Danny wants to lock up both Bradley and Rondo long term. Especially, with Smart and Young now in the fold and the number of times I have heard Danny mention length the last couple of weeks.
Bradley is the perfect combo guard off the bench, borderline starter on a championship caliber team. Stephenson, in my opinion, has a higher ceiling, could better play alongside smart, and could also play the three once they go ahead and dump green which, I feel, will happen this offseason. Not sure where yet.