[Quiet Man Cometh]

I think there isn't too much of an issue with numbers of NPC's, but rather which NPCs get used at any given time. As long as a character has a role to play, then it should be fine I think. There's enough time duringg the events that I've seen so far that it's not really difficult to follow particular characters around.

It's when details about a character's purpose in a story or event get vague that things start to get harder to follow, or so I find.