I agree with this. Although, it seemed really strange to me that Obliteration changed his mind from killing everyone to decide on working on overcoming his fears, just from David's brief and extremely vague proposition of what his theory was about Obliteration's weakness.
Obliteration had being using his powers consistently right before this interaction with David, he should be acting "evil," and this brief verbal explanation should have fallen on deaf ears. I'm not liking Obliteration's exit from the story.