They are miles better without him. Even if they lose, at least they won't lose horribly. They have been testing several duelists but even sentinels and initiators have better kdas than Swerl. Having no duelist is better than having Swerl as a duelist.
Swerl fans will lie "they won't win anymore without him blablabla" about a team that never won anything with him but he is permanently benched and it will never change.