I think it depends on a myriad of factors. Maybe they get scholarships to another program. Maybe comfort of having a match track record > money saved. Side note, I believe from what I read on their site that they may have more specific traffic rules. I think I saw that once they send an A, you can only hold theirs and one other. (someone who's been to the interview/accepted, pls clarify)
Personally, I think that KP is such a big name in healthcare that they are going to pull out all the stops to ensure their first set of students are successful.