Look, we saw what a difference RJ made when he decided to actually do something besides spot up. When he drove and looked to create or get to the rim he actually made the team look much better. With Jax, you get that on a regular basis and he's a better passer/ball handler to boot. So no longer will that be the exception, but the norm.
I don't care how many Jax misses (to a certain degree obviously), I care that he will not be punked and I care about having another guy the people in the locker room trust. It could breath new life into the team as I've compared RJ to a sickness that doesn't seem to be serious so you never go to the doctor; you just never feel fully healthy.
I'm not expecting any major step forward, but this will force a better defensive unit from Pop and I will enjoy watching them much, much more. I'm going on record saying Jax will make the team better basketball wise and it will be noticeable.
Having said that, if the Spurs don't land a big man, the point is somewhat moot, although the Spurs are better now than before so hard to complain if people liked their chances as all before with RJ.