Good questions.

1. I think Michael Malone should experiment. I understand the desire to always have one of Murray or Jokic on the court. In the playoffs, you will almost certainly want one of them on the floor at all times. But I agree that Reggie may work better with the freedom of a lead ball handler. I also think Braun, Peyton, and Strawther work really well next to Jokic. So staggering KCP and MPJ might be as effective in the regular season as staggering Murray.
2. Too soon to know. But he has not looked like a reliable piece at all.
3. I don't really have an answer for this.