even if he didn't, the result is still pretty realistic. arrested development means the person gets emotionally 'stuck' in a certain age, has childish reactions to stuff (children can be cruel to animals because they ar not quite able to consider the animal's pain - and hancock has kicked small animals 'just because'), childish explanations for stuff ('because i'm beautiful!!!') and feel kinship with children/childish people (hancock likes luffy, who is quite childish himself) even as grown-ups.
it's sad.