I am pointing out what we see on defense. Communication on what we are doing has to come from the first person getting back in transition and I don't know what you were looking at, but very often that is or has been Kyle. HOw many times did he pick up Dwight Howard until LMA was able to get him. Danny does this a lot too, in getting back in transition and running to the paint.
Kyle has actually been in the system longer than LMA and was a damn fine leader in SL. This is not something I would ask him to do on defense. It has to be the big man, wings are usually not in the best angle of view to call out what they are doing. It is usually the center's job. Maybe a defensive minded PF does that for other teams, but I don't see LMA pointing out anything or talking to anyone on defense. I am telling you what I see. I see Kyle pointing out to others where to be when he plays. He's seen a lot of garbage time with guys just as him or with less experience than him in Ray Mc, Simmons and Boban.
I would not have expected that we need this from him in the big leagues, but someone has to, if he's at the 4 he could be in position to defend PnR and may have to communicate with LMA on defensive rotations. Being a leader comes naturally for some guys. Kawhi is not a vocal person, Kyle is. Just look at them play. How often is Kyle talking to others.