User blog comment:Thailog/Ep. 207 "Depths" discussion/@comment-74.240.240.11-20120614195554/@comment-5175281-20120614200215

Maybe he is a solo hero because he believes he is old enough, and want to handle the villains alone. Plus he also didn't want to be Aquaman's sidekick when he had the chance so he may have never wanted to be a hero. Or he never joined the team, but just helped them out because the he was involved or just wanted too. Or being a superhero for him was a one time thing.