Who Else Other Than You?
Krune is always using part of his mind with the Mind Splitting Technique to cultivate. So it was the first time he had to stop in a while. Instead, he just sent the Spiritual and Elemental Source Energy as they had agreed.
Of course, as weak as Krune and Heavin's connection might be, it would never be broken since Heavin is Krune's Divine Soul. Let alone now that he isn't blocking Krune anymore, so Krune could feel everything that was happening to him. Heavin instinctively knew that as well that his life was directly connected with Krune.
Surprisingly, Heavin really could cultivate by himself. Not only that, but Krune felt like Heavin was a lot better at it than himself. Of course, It was not like Krune didn't think about this possibility. After all, Krune is not in full control of Heavin at the moment. Even if he was, chances are that Heavin would still be better at it since he is the Divine Soul itself.