let me put it this way: have you ever checked all the relic forum members for multi-accounting? i'm fairly certain that at some point all those accounts have posted from the same ip... there's a multitude of ways for a big amount of users to have the same ip address, proxy servers being one of them. proxy servers also are a means to bypass ip bans fairly easily.
Yes as far as I know relic has a single public IP address, at least from what I've seen. And I know how PAT/NAT works, the fact of the matter remains that he openly admitted to being Raz. I even have it screenshot at home if people still don't believe. But the odds of two different users logging in from the same ip back to back and both those users happening to be Raz & dbmb and them being different people is astronomically low. Plus both would have to be on the same ISP, in the same area... That's a lot of coincidences.
You're assuming that there are two different people that both play coh2, live in the same area, use the same ISP, both are under investigation for cheating/having cheated, one openly admits to being the other and yet they're not the same person... I don't buy it.