I believe they are a better team if they could figure out a way to integrate TSJ with Ant on the court together.They keep him because he's cheap insurance for this very scenario where multiple guards are injured. Now, if they could trade him for a legit rotation piece then sure, they probably do that. But if they can't find the right trade they're not going to just unload him for whatever just because he would be better off. The bitter reality is that professional sports franchises are no different than corporations writ large in that betterment of their employees is only valued to the extent it helps the bottom line. Altruism isn't part of the equation.
The idea that they must be mutually exclusive players on the court is sign of a weak coach (or at least "not creative") IMO.

