I recently made a career change, it is holding up plans to compete. I love to compete, tournament day is the most fun you can have.
To the question.
I think Cesar is just unusually "real". I will take my journey as an example. I am a Brown belt. It is widely said from brown to black the most notably change is your game not only simplifies but the personality of your game is defined and precise.
I have many of the qualities of a black belt in my game, but there is not the precision as if I had the consistency of training like before my career change. I lack the precision, notably in that my piers are not complaining that I be promoted. It is common in our academy that everybody knows when it is time because we have examples of each belt level.
Nick's boxing coach commented the other day after watching me roll, and said "Black Belt!". Cesar and I both said, well maybe? but there needs to be some consistency. Its just being "Real", the mat does not lie, just people lie to each other and themselves.
In my opinion, thats all is, just being "Real".
I actually think I was promoted early at each belt level, because Cesar knew I would wear a belt and be pushed to live up to it. But the promotion to black is serious and he is just waiting for me to actually display and demonstrate it first for that promotion. And with the 15 years at this I agree.
Note; The expectations are very much technical minded, not letting athletic ability to mask sloppy technique. Example; Jason Manly's journey, a world class athlete who put himself through school at UC Berkeley on a Track scholarship. It takes time to develop technique when you have so many other tools.
I hope that makes sense.