If you're asking me three arts I just said are watered down in most gyms so MMA you can't kick people a lot of times when they're down and ufc anyways no 12 to 6 elbows no headbuts no fish hooks no you know there's a lot of rules and any kind of sport that comes from martial arts is like this now weather that's how you train well? But most bjj places train starting on there knees now,the first UFC's those were the best to watch it was style verse style and barely any rules at all watch some of them old ufcs those are fun to watch but basically every sport has to have rules for the safety of the combatants and a lot of schools that's their same philosophy to keep students they have to have safe training
When you say MMA rules you mean UFC rules, promoters can, in the UK and most of Europe use the rules they want. Fighters agree and fight, or disagree and don't,. Some promotions use the UFC, saved them thinking up their own but it's up to them.
BJJ, we start standing.