Yeah I was aware of most of the things which can be recognised. Although, I did based my replies on Tor rather than a VPN. Thanks for the link though, I wasn't certain on a few things.
I don't know how he did it but BadBear previously figured out someone's alts a while ago and they all exclusively used tor (I figured out a few of them from various other evidence but he found a load more). I even made a joke he should join the NSA

but maybe it was through cookies or something else only the admins know about.
Experience I suppose. He probably can identify a lot of people without even knowing the technical process of it all.