and this is why statements like "we all knew long before that she is indeed one of the most powerful beings on the planet" cant be assumed as even when the writers make such a claim there will be some who will still debunk it because its storm. Had this been said about Sue, Thor, Dr. Strange, Hulk, Jean, etc. people would accept it but because its storm we have to be realistic? We have to keep in mind as readers we have yet to see storm's full potential utilized (it was hinted at in roguestorm, galatic core,, black vortex) but Knull possessing her could have given him insight to that full potential that is bubbling beneath the surface.