Review Detail of Jackleell in Dragon in Marvel

What's the point of the protagonist having all that power only to be nerfed? He could have stayed in the void and asked that entity to teach him how to create a universal wall, forge a new universe, and then reconstruct his own universe from scratch. Moreover, he could learn how to extract souls from his own because I'm convinced that one cannot simply absorb souls without leaving an echo of the other souls behind. Alternatively, there should have been a storyline where he grapples with insanity due to the overwhelming nature of his abilities. This story lacks coherence and depth.