So anyhow, first off maybe I'm alone, but how often has the Freeze implementation affected you? I've never been affected by it yet. Then again I rarely run the GD.
But still, I can't imagine that's boosting the TO that much. I think it makes sense for both the TO and GD to be up there.
As for the next factions being added, I think the SG are a top tier (along with PE, GD, TO, JE, and maybe DD)
But anyhow I do think the number of CG plays has something to do with it too--I haven't seen as many newer players running them, certainly seems to be more experienced/good players running them, so that might be part of their good ranking.