USC Basketball's Mystifying Roster Changes

Pictured above is a screen capture from ESPN's preseason men's college basketball power rankings. The comments about USC read:

"One super-frosh is gone in O.J. Mayo, but another takes his place in DeMar DeRozan"

I think this naturally invites a few questions:

1) Which "super-frosh" is inside of O.J. Mayo? How did he fit? Does O.J. know?

2) The "super-frosh" inside of O.J. Mayo used to be inside of DeMar DeRozan? Who is the new guy inside of DeRozan? Is he the same size as the guy now inside of Mayo? Because, really, that seems like the most sensible and least painful solution.

Nice writing, team!