I mean you cant punch too the head so boxing and muay thai wont do any good in it, it shud be considered as a wrestling type org not MMA.
Pankrase is def mma. Dana and others want to limit your view of mma. A lot of ma's deal w/ open palm strikes and things and it's motto is/ was hybrid wresting. It has a base in pro wrestling and, like shooto is different from what you're used to, but it opens you up to what else there is. Also it has produced many ppl who were successful in mma that you're used to that say they learned to do what they do in Pankration. Enjoy it for what it is. But, yes, it is mma. Oh, and it's older than ufc or pride...