Everyone would speak well about their former coaches
You can look at;
Reasons why teams are losing (is it aim, or lack of strategy?)
How well you counter strat teams, especially after long breaks, loud shouldn’t be getting 10 rounds on breeze
How well you adjust on timeouts
Protocols the team has
How innovative teams are
These are all visible and if you look at potter she’s absolutely flawless
Even just watching EG now you can tell they have the supreme meta read, and were able to bring out a deadlock and do it really well, they lost vs loud because of an obvious skill diff (anti strat wasn’t that good either but they didn’t play enough rounds map 2 to know for sure)