This fight would be a clash. Who wins this! Mugabi gave Hagler hell while LaMotta gave Robinson both his first loss and his first knockdown.
Out of interest who was the physically bigger man? I suspected LaMotta was a bit bigger and could potentially rough John up. After all Duane Thomas managed to break Mugabi with that hook/thumb and Jake would be all over him, fair or foul. Mugabi has one amazing night of courage against Hagler but for me lacks the durability to win this unless he gets in a lucky punch. Jake was pretty durable, he was never KO'd I think? Just stopped by SSR still standing and the suspect KO "loss" to Billy Fox so think Jake can take whatever John throws at him and then break his heart.
John Mugabi had a rough time against James Green's pressure who was a short stocky fighter. Lamotta would be too much for him a late stoppage.
This would be a bruising fight between one of the greatest punchers at that weight, against one of the greatest chins.... Lamotta didn't have the firepower and total skills of Hagler or even James Green for that matter, but he probably was mentally tougher than the both of them. Mugabi wouldn't be able to discourage Lamotta and keep him at his preferred range ,mid-distance. Lamotta would close the distance, out work Mugabi, win a close dec.