Ahhh, so the intent was to bring Knull, his full powers, and resources into the heart of the rot. IMO, Knull's full potential has yet to be explored. The most that we've seen was how powerful a portion of his power made Gorr. Symbiotic hosts as well to a lesser degree. IMO, because of how powerful Gorr was, I'd say that Knull was likely a threat to all creation, that would grow in power over time.