I'm glad Nicholas wasn't too Sue-y for you :) I did fret a lot about it and worked carefully to keep him from toppling over the edge.

And honestly, I think most of the Torchwood crew would not be as impressed with the Doctor as ordinary people. They're used to a mysterious charismatic leader, and they've already acclimated to the whole "aliens exist" thing :D

In my personal canon, Nicholas doesn't stay all that long with the Doctor -- six months at most, before one day calling the Doctor "Jack" by mistake and realising that it's time to go home. Torchwood is where he belongs, after all....