Technically, most of the Inquisitor's companions swear eternal allegiance to you, including your proper Sith Apprentice.
And technically I would sleep with my eyes open when anyone of them is in the same room. They just follow you because you are the big head honcho right now. The bonehead will stab you in the back the moment he sees an opening, Khem Val will run off and devour the galaxy if you don't feed him enough (and he manages to break free). The pirate wil leave you once he finds a better gig, Talos is a relic nerd, and the clownfish... she's a mess, the less said about her the better. Didn't really miss any of them.
As for the warrior:
I thought when Vette came back it would be "Blues Sister reloaded", but meh, she found a better gig with the horny guy and treats you like a distant relative. Little girl grew up so fast...
Not sure how Jaesa would fit in anyway. LS Jaesa would have most likely been killed saving a whale somwhere, while DS Jaesa.. I mean she was pretty cool offering to create a legacy with me, but I have that nagging suspicion that crazy womyn would have eaten mah babbies at some point...
At least Pierce is still a bro.
And he was never mentioned again after recruting.
It was obviously to cut costs. How many lines did Vette have in that mission anyway? Probably less then on Korriban.