From what I've been reading and what RS just posted, it looks as if the Pats are looking for a back who would be more of a 3rd down back and not a lead back. I think White will be gone by the time he gets to Baltimore at 14 and Williams may be gone before that.
As far as Starks goes they had to get rid of him due to his large salary, but I've read in interviews that he was in some intense pain especially in that Denver game granted he shouldn't have even been out there but it was gutsy.