I'm also banned on brazil for pub hacking, anyway im competitive in highlevel without hack and know the scenario.
I know alot and ALOT of cheating, powah uses 2 differently ways of attacking... 1 with sniper and 1 with scout, with sniper he scans triggerbot with a key for be legit and prolly the triggerbot spread..a good one.
with scout some videos showed some smooth aim with center of the body as aim_bone with all legit feature possible but still noticiable sometimes.
And too many suspecious wallhack scenes. (but i believe hes good to not use wallhack at least.)
Flay is different, and also very good in css in high level games. I can just say powah is a hacker.
important: brazilians is not full of hackers, we have like 5-6 hackers i know by name.. some banned forever like me ;)