I love Otis but he is a comedy character. If he ever makes it to a title match it will be as a comedy character or to take a pin. Still, I think he can be legit in the tag division and get a run or so in the mid card.
He's a money maker midcard/upper midcard act for a long time if neither party doesn't goof it up and he doesn't get the injuries rolling. He'd be that perfect guy who can be a tag champ, IC champ or US champ and you'd buy it because he's strong and DUMMY THICC and credible against any of these tiers of guys if they book him strong. Tucker is underrated, too. Its a nice organic tag team. Big star as in heavyweight champ run of any substantial duration? Eh, maybe 3 years or so down the line if they book him strong enough they can give him Kofi's booking now and have OTISMANIA RUNNIN' WILD.
His look is super marketable, what are you guys talking about? He's a walking talking viral meme waiting to happen. Can we stop talking about potential stars as if they all have to look like big chiseled dudes? That was barely even true in 1999 and it sure as hell ain't true now.
His unique look and physical charisma and overall weirdness could take him very far
He's fun, but no. Not main event material. I actually have trouble understanding what he's saying most of the time, and honestly I think casual fans too. They react to him when he speaks but kinda frostily. It's like "yaaay Otis let's cheer, wait what is he even saying?"
He's super funny as a Chris Farley sort of character, natural comedic charisma. But that's it. And that's enough.
The middle and bottom of the card has to be filled with quality entertaining people too. I think sometimes people get too obsessed with the idea that being at the top of the card means you're the only one with value to the show.