I doubt its AvovA since they moved togheter from the same team, Koldamenta was an estabilished IGL in PUBG and now valorant for a long time so I doubt he's a toxic person or someone that has bad interpersonal relationships(you dont become a leader by being a cunt).
If its keloqz i feel like its more on nukkye cause like, yea I can imagine keloqz having an ego, but hes a also a kid, you should forgive him and maybe communicate more to him since young players tend to build egos very fast but then soften once they start bing more in a team environment.
If its mixwell, then Id say nukkye is more in the reason, a veteran like Mixwell should be the one creating a positive atmosphere, not making players uncomfortable