If I'm reading into it correctly, there seems to be a line that divides playable companions into two groups: The tadpoled ones which are also playable as origin characters, and the rest of them.
It’s been confirmed in recent interview that Minsc will be tadpoled as well. If Minsc is tadpoled, why wouldn’t the others be? And while Jaheira and Helsin don’t seem to be tadpoled when we meet them, they might get their own parasite before joining our party. We have seen in recent spoiler demo than Minthara still isn’t a companion in act2 - same might be true of Helsin. Some contested if Minthara is tadpoled but I always thought she was - she does share and has control over mind link, which is something we have only see true souls do.
As such, I expect companions to have much less content overall on account of being late party additions. I do hope, though, that once they joint they will be just as interactable as the rest of the party.
