There are 3 aspects of aiming. 1. mouse movement 2. hand+ eye coordination 3. movement 4. muscle memory. So even if he has his 3 perks maxed out hes not gonna win against a guy with all 4. That's where he hit his ceiling. His raw aim is better than any other pro imo but in-game that familiarity factor really matters. Imagine he stuck to similar settings for like 2 yrs at least. He would have been unstoppable