Mma, kokondo and jukido?

why dont any mma fighters train in kokondo karate or jukido jujitsu? along with the normal muay thai and bjj or boxing and wrestling training, either of these 2 forms of martial arts seem like they could make an excellent addition to an mma fighter skill set i am 18 i train in muay thai and bjj. i want to add... show more why dont any mma fighters train in kokondo karate or jukido jujitsu?
along with the normal muay thai and bjj or boxing and wrestling training, either of these 2 forms of martial arts seem like they could make an excellent addition to an mma fighter skill set

i am 18 i train in muay thai and bjj. i want to add a third martial art to my agenda. do u advised either kokondo karate, jukido jujitsu or shotokan karate?

please try to answer each question without the cliche answer. thanks :)
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