I don't think it would produce the fireworks people expect because Angel Garcia respects the Mayweathers.
That means nothing once they become adversaries.
I don't see what the big deal would be. Angel would just kiss ass since they aren't foreigners. Though Angel did hurl racial slurs towards Judah who's also American, if you're into that kinda thing.
But can we think about the fight for a moment and how lopsided it would be? Floyd would make Danny his property.