There are maps where he doesn't do so well like Woot or other open maps, mainly because sometimes he is "alone" on the other team and you have 2-3 good players on opposing sides just targeting him.
It's really hard to be 100% certain if he is cheating or not cheating . He is good that's a certain, now if he on top of that also uses something else that's the my main doubt and I think he does... but I cant prove it. A way to prove it was to force him to provide a Demo and a Screen recording of the same matches (Any Nvidia card records them if you want or just use Fraps)... until that is done it's always allowing him to play freely.
There was a dude named Ket (??) last night and he was totally slaying everybody still he didn't had that obscene frag amount over everybody else that SBT sometimes have and can be 200-250+ frags more than the second "fragger" on the match.
Also yesterday there was this 250-300 ping plus 20-30% PL player that ended the game with 75% eff. Cant remember the nick now but I think he was from one of those American Continent countries. He rarely missed a shot and even playing in a "ZP/ NewNet" environment, playing with that amount of Lag and PL on top makes your playing extremely difficult. Yet he had no issues in targeting everybody and he was not Spawn Spamming π
So yes I assume he was cheating and if so it means stuff passes on the server.