If true, it's only adding to the theory that Sloan doesn't develop players well.
At times, especially against some matchups, Fesenko was more effective than Okur. Fes helped to mask Boozer's deficiency better than Matador Memo did. Fes was rarely used down the stretch because Sloan evidently liked Okur's 3-point shooting (which didn't always compensate for his defense). But the outside shot is more replaceable than inside D.
Barring someone who might end up with a prison sentence or who really messes up chemistry in the locker room or practice, the #1 criterion for evaluating a player should be what they do on the court. Fes doesn't pay a lot of attention in the huddle, but he is possibly the best matchup against the Twin Towers of Tinseltown that Utah has (depending on how Jefferson pans out defensively; AJ would likely take the other one anyway). I'm not convinced that Francisco Dutchman will be able to do the same.