Broner's training situation is simple
Stafford is a good coach. He is not a Yoel Judah (a kickboxer), he's an actual coach. If Broner is willing to listen to him & let him have full control, there's no reason he shouldn't stay. I get tired of trainers who get bashed because they are unknown. There's a lot of good unknown trainers out there who will never make a name for themselves because they never had that one fighter to take them to the next level.
If Broner wants to fight like Mayweather, he needs a new trainer. This is actually something Broner's team should really look at. Broner's popularity started growing when he started using the shoulder roll. He became a more entertaining fighter. The shoulder roll is aesthetically pleasing to watch. They were able to market him as the next Mayweather. He can still get more viewers. That style is what's hot at the moment. However, since he's made a name for himself one could argue he should just abandon it. Eddie Mustafa Muhammad said he should get rid of it all together.
The biggest problem with Broner imo is not throwing enough punches. His defense can be improved, but he doesn't let his hands go enough. He gets outworked easily and it causes him to lose rounds he shouldn't.
Freddie Roach would be a good trainer for him imo