Except that it's not *your* character when it's an NPC character.
There are plenty of players who don't play on Dwilight. And a rotation wouldn't require 20 players to do. Even a rotation of a mere two would force info to be written down somewhere, or at least shared so that if one guy goes, odds are the other guy knows most of what he did.
Wait who says its not the GM's character? He is the one that has put in the effort creating the character, the background and interactions. Apart from the fact that NPCs are tied to individual GM accounts and thus you would have to share accounts to share characters, when has Tom ever stated that the NPC's are some sort of common property of the GM team?
Poll