According to the wiki he has energy absorption powers that could potentially evolve to manipulating the Power Cosmic
And his plant nature means that he can just regrow any damage done to his body, like Groot
I wouldn't be surprised if he inherited some of Mantis' psychic abilities.
But the issue is that this isn't just a fight between kings (for now). Teddy might be able to whup Quoi's ass, but between Tony's virus Wrecking the fleet and Quoi killing all of the defenseless pilots, the Kree-Skrull army is significantly weakened.
Meanwhile the Cotati Empyrean hasn't taken any losses, and could potentially weaponize any plant life on Earth