Yes, it's correct. You'll meet the two of them fairly quicky when you arrive in the town of Cyseal (one is in the inn, the other in the library of the town hall).
But anyway, shortly after that, you'll be able to recrute henchmen of all kinds, so if you want your mains to be the same as the recrutable NPC, it's no problem either.
As for who the character who speaks is, you have manual control over it for all conversation that you'll trigger yourself. The main active character will do the talking. But in some instance, dialogs are triggered automatically. In those case, the character who talks seems to be a bit random, which might be a sort of bug, I'd guess.
Last edited by Tixu; 09/07/14 12:36 PM.