Yes, he seems to be gone by New Rapture's time (1971), but his popularity with fans might yet have him reappear (heck Delta was mulch for ~10 years). Either way, that wouldn't stop Flashbacks to Rapture's Golden Age, or the time of earlier events (Kashmir Incident, or when Jack runs into him) which could be recreated (many Rapture Flashback episodes would be likely for Players to create). The MMORPG can handle many 'side' scenarios that are not part of the main game plotline (if all else fails - imaginary scenes). " An ADAM cocktail, A gallon of Plaster and Thou (tied to a chair) " - - - - -