A pm would have been better to keep things on topic, but this is my forum name, not my game name, and I play on the wcs, and no I am not Mozart. I like watching demos of the accused to pass time while I eat, since eating and playing doesn't really work well. Most people don't know how to catch wall hackers. Using r_drawothermodels, you can clearly see where everyone else is within his point of view. He never goes at people that can be seen through walls, and he never aims at people through walls, and he never looks at walls which would mean he is looking across the map for people. Out of everyone he kills, the one kill he got on that guy around the corner, closer to the end of the demo, it might seem a bit odd, but there was sound from that direction, and there is always his radar. If that person showed up on his radar for even a second, he might have noticed. It's just a bad call overall considering all the demos too, there is no evidence of wall hacking, but there is plenty of evidence of people QQ'ing when someone is doing better.
And notice though, Mozart is not all that great, it is his class skills that help him more than anything. Wall hackers with his aim (he aims pretty decently) would have a much higher score than him don't you think? And it is a lot harder on any wcs server to catch someone hacking unless it is plainly obvious.