Well the problem is, you are arguing with me without a shred of evidence showing any wall hacking. The only thing the demos show, is someone playing normally.

I suggest if you want to see if he is hacking, go check some older sourcetv demos. If there is a way to tell who is playing on each demo before downloading it, that would save you time, otherwise you'll have to do trial and error. With all you nubs accusing him in game, you ruin any chance of catching him if he actually is. The only way to know for sure is if you find a demo with him playing and no one is openly accusing him.