Zemo was kind of like that, since a lot of his plan relied on the fact that he couldn't physically take on the Avengers but have them tear each other apart.
But considering they've already killed off Killmonger and Klaw, on-top of M'Baku and T'Challa coming to an accord of sorts, I'd be surprised if Achebe isn't the villain of the sequel unless they bring in a character from another property.