To answer this:
If you examine the landscape of what is considered a "major cable network" you only have so many options in terms of companies.
Meltzer has already shut down the idea of ESPN. Says that's not happening. Too many times they'd have to be pre-empted for sports.
You have Viacom, but other than Bellator (which the current regime there was grandfathered into) they have shied away from live sports and a wrestling show doesn't really fit the profile of any of their networks.
NBCU isn't taking anything non-WWE when they have Raw. Same with FOX and FS1.
WGN America could be a candidate, but they really border on what would be considered "major"
Turner fits by process of elimination. They already have live sports on their stations, they could use more of it (every network sees live content as what's hot at the moment). From a demographic perspective the fit works.
So when you really examine what is known, there's a reason Turner keeps coming up. Besides the fact that no one who would know has denied it despite it being the most popular speculation, it just fits if you make all the logical conclusions.
You see I didn't know ESPN is off the table.
I think wrestling would fit MTV for Viacom, who at the very least has had wrestling on their channels in the last five years.