I think that Isiah's reference to Tom Chambers was an effort to recalibrate expectations we may have as NBA fans on Tatum's ceiling.
While I think Tatum will exceed Chambers, it's not like Chambers is a slouch. He had a very outstanding career.
Chambers did not make the hall of fame.
Will Tatum? If you asked me to project that last season, I would have said "of course." Now I am less sure. It is just too soon to say.
Hopefully he will turn things around and get back on the trajectory his career seemed to be headed in.