#2 Rey Mysterio
Rey Mysterio's current role in the company is to put over younger talent and establish them as the superstars they are. He did the same for Samoa Joe at WrestleMania, who may be a veteran in the business but is still relatively new in the WWE. He elevated Andrade to the next level, with some really enthralling matches.
We know that Vince McMahon and WWE love the whole David vs. Goliath visual, don't they? This is why they have booked Rey Mysterio to face so many bigger men over the years, and spoken about his heart and his spirit during all his feuds. With Dolph Ziggler gone, WWE may want Sullivan to work with a veteran who can give him some extraordinary matches.
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There is literally nobody better suited for the role than Rey Mysterio is. Not only can Mysterio make Sullivan into a star overnight, but he will also take the pin if the situation demands.