I think people are going to be surprised by just how good Monte is this year. He can pass and shoot, excellent handle, and he really has become quite a defender - I credit a lot of our win against KU in the Big12 tourny to his defense on Thaarp. Long NBA career in future for this kid, in this amateur scouts opinion.
As far as his backup, I am looking less to Custer, and more to Naz, Georges, and maybe BDJ or Matt T. I just don't see Custer playing a ton, less than Monte did early last year, and not gaining minutes later in season like Monte last year.
I would be worried if Monte got seriously injured, as opposed to foul trouble or the 5-8 mpg he is out. Then I think you'd see Naz, or maybe Georges doing the Royce inverted-offense thing consistently.