I've been following the leadup to, and fallout from, Mythcon pretty closely and want to give Thomas a tentative pass (I want to give everyone a pass though).
**The leadup was fraught with a fairly tight-knit (and obsessive) group of Sargon's opponents trying very hard to deplatform Sargon, plus Armoured Skeptic and Shoe-on-Head, who are tangentally connected with him (the old 'guilt by association' trick). When the organisers stood firm they successfully persuaded some speakers to pull out, and made such a stink that the organisers felt they had to spend a substantial amount of cash on extra security. This security issue is the main lever that SJW's and antifa use to pressure event organisers and venues, to their credit, the organisers didn't back down to this.**
I see Thomas as being pulled two ways (that 'tension' I mentioned in a different thread), and this comes out in his over-emoting, I think it is to his credit that he stays the course here, or that he turned up at all, and the 'debate' even settles down to something that looks almost promising at times. Sargon has mentioned several times in follow up videos that this is what he wanted too.
Afterwards, Thomas' own community have been raking him over the coals for various reasons too, but mostly they are just upset that the Mythcon event took place in spite of their efforts. This mistreatment of their own is one of the main sources of SJW's becoming redpilled, which is why I would go easy on Thomas.
Going back to the title of this thread, at present I see Sargon as a good proponent of that 'centre ground'. not necessarily because his political views are central (whatever that means), but because he stands pretty firm and looks both ways as fairly as possible.. in the last month or so he has interviewed both Jared Taylor (Alt-Right 'race realist') and Contrapoints above. Unfortunately, there aren't many Lefties who will debate, so Contrapoints is a bit of a loner, I suppose we can add Thomas to that list, especially if he takes up Sargon's invitation to have an online discussion.
ETA**Sargon recounts most of this at the start of the video I notice, so this paragraph is a bit redundant.