Here's the case Sideshow, they had numlocked on the leader position as the stratcaller/ingame-leader. He was a Reinhardt main, his strats was called from a Reinhardt perspective. Making key decisions from a Reinhardt perspective is difficult already.
Art1er was cut eventually after his limited heropool, which made it problematic for the rest. They realized that numlocked and artier had problems with their respective role.
"There were clearly reasons outside of "not enough calling from seb" to make the switch."
Here's the thing, Seb was calling, but from a limited perspective than a shotcalling Lucio. He wasn't a Lucio main in Dignitas. Get it?
And this is not my argument, this is the argument of the Dignitas team in their statement. They lacked synergy in the decisive moment because of his perspective. It derailed already when Admirable said things like I had something to do with numlocked being kicked out of the squad. Which I do not have at all. I assume that Admirable just said things to heat up the moment, probably because he assumed or thought that I was personal in my post about the reason behind numlocked not in dignitas.
"Why remove the tank, who was calling, rather than any other quiet player to make room?"
See here's the thing, numlocked is supposed to talk most and direct the most. But he wasn't directing in a way that appealed to the team. You get it now? It's hard enough to call from a Reinhardt perspective, imagine if you call to players with obvious language barriers and more? The team wasn't communicating at key moments they needed to communicate the most. I mean you can ask numlocked yourself and see what the answer is.