i can just imagine the colonel seeind dark for the first time and thinking hes damien and the colonel goes in to hug him. dark doesnt want to hurt wilford any further so dark hugs him and says 'we forgive you.'
Anti headcanon: His glitching actually hurts him some - he does it a lot, so you can imagine what his life is like. Periods of high emotional distress cause him to glitch a lot and the pain just doesn't stop, but luckily, he doesn't get those often - when he does, one of the other Egos is usually there to help calm him down.
Ok ok another corruption Dark idea: He has an old picture of the gang (Damien, Wil, Mark, and maybe Celine???) and everytime his aura touches it or just when he grabs it, the picture changes to the their final fate (Wil is insane/turned into Wilford Warfstache, Mark is dead (probs eyes crossed out)/gone from the picture, and just Dark looking another way/Damien and Celine are either next to each other with their respective colors)