First, those are only
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First, those are only nameservers. They are hosted by the same company, just like Brazzillianfartporn.org could be hosted on the same site as the christiansciencemonitor.com.
Forum software could simply be any of the off-the-shelf solutions any web dev in the world would start with. No one is likely to write their own forum system anymore, regardless of what they look like on the surface.
This does not mean they don’t own MMA.tv, but your ‘recently surfaced evidence’ is evidence of nothing.