I forget things, but I thought Shaw was killed by Emma in X-Men Black?
So they resurrected Shaw, but he wasn't already on Krakoa?
Similar problem exists with Emplate. He died quite some time ago and "infected" Monet with whatever it was that compels him to drain the lifeforce of other mutants.
Why on earth you would resurrect a mutant that needs to feed on other mutants for food is a mystery to me.