EVERY school favors their own students basically. Thats because one, obviously they know their own cirriculum and think their school gives good preperation. Also typically if you are a pre med at X school with a med school, you will probaly apply there and be likely to matriculate there. UCI has more UCI kids in the class then others. UCLA has more UCLA kids...etc etc...I wouldnt read too much into it unless the school is like creighton where they specifically state that they do favor and give preference to their own students who did undergrad there.