So, what is the pont of the battle with Calder?

[yes]

I don't see how that sentence implies that they don't usually work together. It's simply a statement in Calder's power that it required six high level, near epic characters to defeat him and his cult.

There's plenty of example of how much strife and tension they had on that team. Gerard and Soon for example. The lack of trust and cooperation. It's part of why they fell apart.

And I'm not sure why she would specify that it required all six of them working together to defeat Calder if that behavior was a fair default expectation.