Three-person booths are a mess in general, even in the best of times.
Like it or not, Mauro has clearly been designated as the star announcer - Nigel and Beth (or whoever) are just there to add garnish. Sour grapes from Corey Graves doesn't change that situation.
With that said, I think Mauro and Barrett would work as a team. But it's all theoretical until we actually hear them together.
Speaking of which, Mauro and the King are the official voices of the new WWE Battlegrounds game. Great news that will definitely drive those last-minute preorders!