When Tex is playing well they are so hard to beat since the rest of the team is so good individually. He is 100% their x-factor. You could make the case Trent is the X-Factor but he is far more consistent than Tex.
they tried that with saya where saya was on chamber and jonah was on raze, and it was easily the guard's worst ever split. jonah isn't really comfortable on raze. they might put trent on raze but he's arguably the best fade in NA including all franchised NA initiators, so i don't know if they would want to do that as fade would also be in meta in a chamber meta.