I would say this is a critique of most NBA coaches, but the prevailing wisdom that you should save your challenge until late in the game is very flawed. The first is that by that time it might not matter.
I think the situation needs to dictate when a challenge is used. Case in point in game 2 on Jaylen's phantom call on GPII that led to his second foul and his sitting. If you have a chance to overturn a call against one of your superstars that will keep him on the court, YOU HAVE TO USE IT. Also, the fact that it likely would have saved them 2 points, it was a clear time to use it. It turns out Payton missed both shots, so, in retrospect, that wasn't a factor. But, the point is that you should always try to keep your superstars out of foul trouble.