I'm pretty sure Pau has rested a game or two. LA has rested at least one game, maybe two? Manu, as you said has rested even though he's looked fine in the first game of a lot of those back to backs. Rudy, I think I recall has rested some. Other players have gotten injured IMO because players being rested sit out the whole game, when all you had to do is limit their minutes within the so called "rest games". Sitting them out altogether from games is counterproductive. It's better that they play, but play less minutes. This way they can keep a rhythm too. Kyle got hurt in a game where resting was in practice. It's overworking the healthy players, who are then getting injured in later games when the extra stress that they're not used to starts ac ulating.
I think LA is doing OK with playing more because he's used to it. He's more conditioned to it. Most of the other players on the team are not. You either get them conditioned, or leave them in their normal roles. Don't half ass it like Pop is doing. That's not helping anything.