He did not stop them via punches. He stopped Kimbo via gut and the referee stopped the fight via unprotected powder-puff strikes. Kimbo didn't tap to strikes nor did he come up bloody. It was a TKO.
He then got past Justin Wren on a close decision. He hardly dominated that fight, though Wren wore himself out and was unlikely to win a third round had it gone to one. Still, the point stands that he didn't stop Wren via punches, just experience and cardio.
McSweeney fell prey to the giant gut and TKO. Sure, he was dazed by a big right, but McSweeney wasn't ground-n-pounded into submission. It was another "just enough to get the win" victory for Nelson.
This tactic didn't work on Schaub, who looked proper dangerous, so Nelson had to actually fire off a solid punch and lay his ass out, and that's really all I want from Roy. The Buddha belly crucifix really wouldn't work in any other weight class. If he's going to use it, then I want his opponents coming up looking like raw hamburger. He's exploiting a loophole of sorts, and good on him for knowing what it takes to win without actually cheating, but at the end of the day, televised sports are as much about sizzle and spectacle as about athletic achievement, and Nelson is never going to top my "must watch" list, let alone my "will pay to see" list.
On the Marcus Jones front, I think Big Baby is a class act, but he's got a glass jaw, and for someone of his size, that won't get him far. Maybe he'd be better suited for pro wrestling, where his solid work ethic and gentle nature can also be assets.
I think Kimbo is unfortunately not hungry enough for his card position. He seems concerned about protecting his reputation, while not yet legitimizing himself in the octagon. I sadly don't want to see young guys fed to Kimbo to make him seem legit, but I also don't want him to just get stepped on before he can develop. It's a real quandary.