As many people already said, vector seems to be caring about this clan. Sure, he can be mean but after actually talking to him like 8 months ago it turned it he is a nice person!
He should be unbanned, I mean how long has it been? 4 months? And he's still here, almost daily... Additionally vector is very helpful, not just because he is a former admin, he also helped me with some issues back in the days.
Vector basically helped a lot of people, including me, who felt like their voices weren't heard, he's actually caring and considering it, though he is banned from all server, which means a lot compared to certain higher ups who just twiddle their thumbs.
Also, you should consider that this isn't just for team fortress 2, vector wants to help on CS:GO (as he already staTed I guess). Furthermore he is interested in contributing something to gmod. All In All he also wants to test maps and stuff.
TL;DR: +1