Cultspeak.
I take it you think the other 7 guys who were expelled were also disrespectful and disloyal, and so received just punishment for their betrayal of The Group. By cult standards, true, the purge was warranted since these traitors 'disrupted group harmony' and 'defied Dear Leader,' which is 'most disrespectful.'
I can't take seriously a grown man who lets another grown man treat him like this and, even worse, makes excuses for it--particularly in the context of a niche sport that you pay to train, not a medieval daimyo's keep. Have some self respect. Davila being told he wasn't good enough and needs to turn the invite down; that's flat-out disgusting, objectively he WAS good enough, and he should never have accepted that. You want to talk life lessons you can take from training, one of the biggest is to stand up for yourself, to know that you are a capable person, and not be a bitch.
Only in martial arts would some grown men dream of taking orders like this. Even in business, where you are doing a paid job, nobody would tolerate this level of employee control that continues even after you quit. It's because people want a Magical Master, and to forget that this is, after all, just athletes training a niche sport, not samurai in Sengoku.