Their main go-kill player sayaplayer seems to have temperament issues. Bud seemed frustrated in the last map against EDG. Controlling your mental is very important especially when you are the backbone of a team and have enough experience.
Let's not psychoanalyze stuff. If you watch their comms videos you'd know that Saya is actually one of the most mentally resilient player on this team alongside Xeta. They lose an unloseable round and Saya immediately always tries to keep everyone's mental in check. When he was playing overwatch, this man was on one of the worst team at the time while performing like s3 faker/prime s1mple. I don't think losing tilts this guy anymore tbh.
I think psychoanalysis is pretty important as it directly affects your midround decision-making. Seemed like defeat against NRG got to his head. You are telling me he'd perform in an opening match the same as he performed against EDG (terrible performance)? That's why maintaining your cool is essential and you CAN judge players over their mental strength.
he was frustrated because he knows t1 are capable of beating edg and that they were really not playing up to their usual level. the experience and mental saya has is very valuable in esports, considering he's found success in both val and ow.
btw his falloff after Reykjavik was because he couldn't adjust to chamber meta, not because of his mental. look at him making another lan now that chamber meta is dead