Oh yeah, it's plausible and I can see it being a good moment when the two meet ("Why can't I break you?") I'm just making fun. It's just always been that power has always struck me as a little meta. 

Though I would like to ask, your description also makes it sound like he's also super-durable? Like, you were saying cut off his limbs and he'll crawl to bite you. At what point does he, like, pass out from blood loss? Go into shock? None of that?