After winning Sburb, every Dave left alive by the end of the game reverted to become part of a singular “original” Dave. That is to say, Dave’s psyche is a patched mixture of Alpha Dave’s psyche, Alternate Timeline Dave’s psyche, and the psyches of any doomed Daves lucky enough to be alone in their timeline instead of dead.
Being ‘reassembled’ like so, early post-game Dave had numerous identity crises. The fragmentation of his memories and sense of self increases the severity of his PTSD tenfold. He occasionally has panic attacks, characterized by intense fear of abandonment or failure.
Based off of davidstrider’s post. Hope you don’t mind me fanarting!