all of those except the disciple have been clearly seen in your party in multiply recent screenshots.
Akari also said, in reference to Visas, Handmaiden, and disciple, that you can't have all three in your party at once. So I take it as confirmation.
The real question: Is the Handmaiden and Visas one person? Better yet, do they COUNT as one of the 12 npcs or do they count as two.
I think she/they are aides to the queen originally, and depending on how you answer the LS/DS revan questions, the queen is either good or bad (she met revan and it changed her or something). Hence her servants are LS/DS as well.
We also, iirc, had a HK (either 50 or 47) droid in your party.
So that leave us with 9 or 10 out of a total of 12 spots filled