sounds like mCe is draconian in the way he coaches.
frustrating to deal with but thats the price for having a good player, not just a player that listens to instructions.
You can't win a world championship simply following a formula to perfection; you have to be able to adapt, think for yourself for whatever you can't plan out ahead of time. It may cause headaches at the start, but if you give those players a chance and enough practice to flesh out their ideas then you'll be able to see them truly shine far above their teammates
Obviously, there are times when the idea they're trying to develop ends up leading nowhere (or who would waste too much time trying to perfect it), and it's okay to put your foot down once in a while when it really matters, but you should have faith in your players who have reached the heights they have to be able to grow themselves organically with your overall strategy.
You didn't pick up yay because he fit your vision perfectly, you picked up yay because he's a masters winner and an amazing player with a certain amount of strengths. mCe should've let him find his footing within the overall macro of the game they were trying to play, rather than forcing him to adapt to the playstyle they outlined for him.
mCe is capable of training and drilling players into a good system that works, but coaches like chet or potter who complement rather than dictate their teams strengths are infinitely better for a team that is meant to be a "superteam" of individually-gifted, veteran stars.