#4 Otis

I don't think there's any Superstar on SmackDown whom fans love more than Otis. He played the perfect underdog in a love triangle and ended up building a reputation as a top singles competitor. He was able to find his muse in Mandy Rose and duo have the fans clamoring for more.
While his feud with Dolph Ziggler doesn't seem to be over yet, Otis is expected to come out on top again. And following a series of monumental victories, plus the backing of the WWE Universe, he will be in the reckoning for a title run.
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WWE have two routes they could go with Otis here. He could continue his exploits as an individual fighter and possibly challenge for the Intercontinental Championship. Mandy Rose and Heavy Machinery have already teased forming a faction and that would even out the numbers game against The Artist Collective.
If the company decides to have Otis and Tucker compete as a team again, the two have enough credibility to challenge for Miz & Morrison's SmackDown Tag Team Championships. Tucker also did well in last week's match against Ziggler thus he too could be rewarded for putting in a good show inside the squared circle.