It is true that factions form when there is no overwhelming ace

Honestly, if the captain of the Korean national football team played at a Messi-level, who would rise up and demand they step down or form factions?
Everyone would just keep their mouths shut and look up to them.
Objectively speaking, since the 2019 Asian Cup, Son Heung-min hasn't lived up to his reputation in the national team, which is why the players are rising up.
It is also a problem that the fandom blindly shields him even when the captain fails to perform in every tournament.
The point is, in these four tournaments, there hasn't been a single one where Son Heung-min performed as the ace.