On cross training:
Get a base FIRST. Don't try to jump into two or more arts that cover the same territory at the same time. Doing both MT and WC all at once will make your life miserable--probably--unless you are a rare and gifted athlete.
If you are dead set on cross training, do two things that have next to no relationship to each other, like catchwrestling and WC or wrestling and WC or Judo and WC or Sambo and WC---catch my drift? Learning two stand-up striking predominant arts is going to be awfully hard on you--not just from a mechanics perspective, but from a strategy perspective.
But, that's just my opinion I more or less agree with Anerlich about the totality of the experience, but I certainly think you need to establish a base of skill in WC, as old jong suggested, before you go looking to add-on.
Caveat: I'm not a WC guy. Cheers.
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