Honestly, I'd rather have Brad coaching the team than a healthy Kyrie.
I don't think a coach, generally, is going to outweigh having a superstar available. But in this case, I think Brad has made a difference in the team getting to where they are now that I'm not sure Kyrie would have made.
Part of that is how well Terry has played in Kyrie's absence. But Brad's excellent gameplanning, in-game adjustments, out of timeout plays etc are part of the reason that so many players have been able to step up in the absence of Kyrie and Hayward.