He has a significant mentality problem. I remember a moment during a professional match, possibly against MIBR or just before that game, when he sighed into the microphone. Zellsis shouted at him not to make those sighs and to stop that behaviour, reminding him that they had it under control. I understand that times can get tough in some games, but actions like that are not characteristic of a tier-one player, regardless of how you look at it, in my opinion.
(https://www.youtube.com/watch?v=xSHKrngMD2s) is where the quote comes from, "We don't have much confidence in each other," he would never have said that about Tenz and Sacy. I'm wondering if the arrival of Bang and Narrate has made a difference in this regard, especially with Narrate sighing on the mic. John, Zellsis, and Zekken still appear unchanged to me. The only potential issue seems to be Bang and Narrate having differing ideas.
In a situation reminiscent of when (https://www.vlr.gg/player/5004/nathan-bocqueho) was allegedly dropped from Leviatan due to having "differing ideas" with both Net and the coaching staff (if I recall correctly), I believe that having a good team requires diverse perspectives. If you want to succeed, it's essential to have players who think differently. I can guarantee that players like Aspas, Derke, Leo, and Nats are all incredible talents, but they will have different ideas compared to outstanding players like Less, Mako, and Meteor, who each excel in their own right, This situation is different because there's a genuinely personal reason on narrates side that needs to be solved in himself, The team cannot help with that unlike with Nathan where he was dropped for differing ideas which imo is just fundamentally stupid for the reasons shared above.
TL:DR, Nothing else changed and Zellsis has been having to really whip narrate into shape on stage, imo that shows he is the problem. I think the best course of action would be to try and get Narrate up to shape quickly and if he isn't there by stage 2 personally I'd drop him and get a new player in.