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Anyone who's saying replace him by him, him by him, him by him has no idea of how team chemistry works. You just can't have a well synergised team-play with players swapping in every time. It affects the mental of both the players being subbed in/out.
People see one good map and go out(come on vlr) to blame one player instead of applauding team's great improvement in chemistry and synergy, just like it happened with pANcada, sacy and now TenZ. One player doesn't make much of a difference in a server of 10 pros. Teamwork matters more
There's a reason why 6 man rosters don't work, both in CS and Val