Yamane would be in charge of things and Noisycroak would be helping her out because she wouldn't have the same type of resources as she did back in the Konami days
Again, you're making assumptions, she has been producing for many other games since she left Konami, that has nothing to do.
And most of those works are as co-compositor and guest arranger, so I give it to you, she may not be in shape for a full soundtrack anymore, but still, the hiring of noisycroak sounds like an imposition from the game director, guided by what Igarashi said.
My point is that this change is another yellow flag for the game, since Yamane was announced as a main composer alongside Yamada (
not as a "supervisor" or as an "inspiration to create songs that sound like something she would make") and now they're announcing that a totally different and new crew is working on it too, kinda sudden and weird like the DICO change itself.
But I think I'll leave it here, if Igarashi allows it, then it must be for something, whatever.