Are we sure that James is Cato? If this gentleman went to the effort of changing his IP, and his UID, if he really was Cato, don't you think he'd use a completely new name too? One that he'd never used before?
About the comma space thing, I've seen a number of my classmates do the same, and some of the systems I've used do it automatically, I think it has to do with certain keyboards/input systems. For example, when I was using a Chinese keyboards, often there would be spaces put in front of the comma. The same with some French systems.
I'm just playing devil's advocate here, as James deserves a completely fair hearing, with both positions represented.
Edit:- I've had a read of James's posts here, and Cato's posts on the MK forum. I must say, their tone is very similar, but not exactly the same (change might be expected after 3 years, anyway). One thing I did notice is that Cato always used the correct formulations "I am" or "I'm", allbeit sometimes with a lower-case 'I', and James here always uses the incorrect formulation "Im". It would seem strange to me for someone's grammar to get worse over three years. Just a thought.