If the mma classes are good enough, you will get strong through the training. I wouldn't bother with the ninjitsu. . Stick to the mma and throw in some pure muay Thai or kick jujitsu if you feel the need to do extra. Be wary of over training as the addiction hits you.
Eat clean and rest well.
What will be, will be. Go get em rock :thumbup:
cheers bud