Originally posted by: AssertnFailure
it has been stated a few times though, that the 3rd hokage did take into account a few other factors when planning special arrangements of the teams, specifically naruto and sasuke both being under the guidance of kakashi.

I think everything other than that was just based on test scores though.
Maybe more than that... he set up Ino-Shika-Chou under Kurenai on purpose as well.