Gutcheck is scripted. I'm 100% confident in saying that. There could be an element of reality to some small parts of the concept but TNA is not hiring people based off a single match and maybe a short promo.
As to Cage and the degree of his involvement with TNA, it's entirely possible that he was a one-night or an as-needed hire, called in to be 'the other guy that fans like' against Bradley for no other purpose than to give the story a bit more bite. Indy guys, PWG associated talents in particular, tend to appear as 'fillers', for lack of a better term, every so often. Or, it seems that way to me.
In any case, I like Cage enough that I wanted some indication that he'd become a regular on Impact. That didn't happen with the Gutcheck segment, so that's something of a let down. But whatever, it's not like he's been dropped into a bottomless pit, never to be seen again in a wrestling ring.