#4 Nia Jax

The Irresistible force, Nia Jax.
Maybe it's a little too early to feed Nia Jax to Ronda Rousey, but the match would be the best way to create reasonable doubt about whether Rousey will lose in her debut or not. Not only that, the match also puts two of the strongest athletes of The WWE in the same ring with The Woman's Title on the line.
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Again, it might be a little too early to do this with Jax, especially since she hasn't even had a run with The Raw Woman's title yet, but it would probably be one of the company's best shots at creating a realistic match for Rousey. In the end, though, this match lacks star power and that's a huge drawback for WWE.