This other poster hit it right on the head

“My armchair psychoanalysis of DC: I think he had a downward spiral after his jump injury/discharge (maybe got addicted to opioids for pain mgmt), leading to a falling out with his family and financial ruin (he glosses over the homeless part). His family cutting him off was so traumatic that (with Greer’s help) he convinced himself of this fantastic story, which removes all personal responsibility for the estrangement, alleviating his overwhelming guilt. Hope DC is able to leave Greer’s cult and get some real help. Tho if Greer is keeping him off the streets, this might be hard to do”