So, post 2.21, I want the version of the world where there was no change of heart, no Road to Damascus, where Finch went for revenge rather than redemption, and IFT and Decima are in a shadow war to rule the world. Reese was recruited for his killer nature rather than his boy scout one, and serves as Finch's enforcer - Vader to his Emperor. You could map this out with more people if desired - Carter is Quinn, and she and Fusco run HR, Root is - probably still herself, just now she's openly fighting for the rights of the slaved AI's, and so on.

Bonus points for giving all the guys a Beard of Evil, particularly if Finch has a set of Victorian era muttonchops (Look, he rocks the sideburns already...)