It's just that in KotOR I, some of the party NPCs got shorted in the banter/dialog department. Carth and Bastila would often interject into conversations, but take Juhani or T3 with you, and most of the time you'd hardly know they're there.
I'm wondering if it's the same in TSL. Granted, I haven't played enough to say for sure, but it looks like Bao-Dur, for example, has much less to say during your travels than Kreia or Atton.
Also, IIRC I can't remember much inter-party banter in TSL--i.e. two party members having a conversation/argument between themselves, separate from other NPC encounters. This happened several times in KotOR I. Did I just not have the right pairings?
Again, any help/hints would be appreciated.