see, we keep hearing that very thing. If an mma guy tried to come in, which would HAVE TO be behind the jab, they'd get fookin destroyed. Like I said, we only ever see MEDIOCRE boxers in mma. If Roy Jones Jr had fought someone of his weight, he'd kill them.
How do you figure that? Have you ever heard of kicks? If the MMA guy came in he'd most likely just try and avoid punching range if he had any sense with the boxer and keep it at kicking range. He'd have to go through it at some point if he couldn't finish with kicks which is mostly unlikely but how would the boxer defend kicks?

Yeah we have only seen mediocre boxers in MMA but even a mediocre boxer could make it to the clinch with even RJJ. If that happened in MMA then it would be all over for RJJ.