Board Thread:Speculation House/@comment-165.234.209.154-20141001140830/@comment-25399914-20141001171329

It could be random like the assignment of teams Both Jaune and Ruby were the second people to pick up the chess pieces which made up there teams.

If the leaders aren't random then the leader psychological assessments might have been one as part of the rigorous entrance exam.

Cardin is easily explained as Ozpin himself admits he makes mistakes, maybe Cardin's selection was one.