Not to transform another thread into "Krakoa is out of character and bad etc." But
They did mention Proteus in HOX though.
And didn't they interact during the last X-Gala ?
Also I wish Banshee's pain to discover (off panel) that the woman he loved was still living while she killed him and use his skin was explored more explicitely in LoX.
I also wondered a bit if Rahne's path would cross Moira in New Mutants during her arc in the Shadow King story but nope.