I think that, maybe it's wishful thinking on my behalf, but it's possible that Jax, Stryker, and maybe someone else from the Special Forces, or Jax as two variations, could take one roster slot and just have different characters as each variation?

I just do not see what they could possibly do for Jax for the variations and he has always been one of my least favorite characters, so I guess I'm biased, but I think he should just take one variation in a combo roster slot, along with possibly Stryker. I would have suggested Jacqui, but I feel like if anything, she needs to be her own character.