It has to be Cassell. He seves no purpose on the bench he is just taking up a spot for someone else. He is sitting on the bench coaching already so just give him a coaching job. Patty O is too young and any 7 footer that young has potential especially under cliff ray.
The only thing about Cassell is I really think they have (or had) plans for him to come back late in the season and play. There really is not much other explanation for him not playing so far. If he simply had nothing left, they would have just cut him, or would be using him in garbage minutes or something. They are clearly making an honest effort to rest him.
Now, it is certainly within the realm of possibility that they have, or will decide that its a failed experiment and cut him. But I just have a feeling POB will be on the cutting block first, unless they are brining in a PG.