There is no dialogue for any of these characters (save a few lines for the player to say to Betsy), but script notes paint a reasonably clear picture of what would go on (if not the character's motivations). They are all part of an unnamed quest that would eventually net the player Betsy as a permanent follower. These are Betsy the Brahmin, Tom Dooley, and Kevin Hargrove. There are three interesting disabled NPCs in Freeside and the surrounding area linked to a cut quest/follower. Were these NPCs going to be Kings found OUTSIDE Freeside? The old enable/disable scripts also show there were originally several Kings members guarding the water pump, not just one. These are next to the NPC VFSExteriorGateKing which is used for the Kings outside the gate. Interestingly there are lots of kings set up with the name 'external', (e.g.VFSExteriorKing01). In particular, at some stage there would be large groups of patrolling kings, the NPCs VFSKingsPatrol01Follower (etc) are set to follow the NPC VFSKingsPatrolLeader, but in the final game the leader is the only NPC used. There are unused patrol routes for the Kings all over the area, and lots of unused King NPCs. He has posted a collation of his findings on Rusted Logic.There were supposed to be lots more Kings around.
Moburma is a modder who has been restoring cut content to Fallout: New Vegas.