Oh I see, so even though other companions can do the talking, if you control them, you can't 'win the game' as them, it will go to whoever the main character is?
In early access if your main character dies, the game is over then? And just lastly, in Divinity 2, I remember it being a little different because wasn't everybody the main character in that game and they were all competing as part of the story to become the god so to speak?
Yes, you can only win the game as the main character you start as. Haven't played early access but I'm pretty sure it is the same. DOS2 I haven't played in a very long time but iirc the party members couldn't "die" while combat was active unless the whole party was knocked out so your character could be knocked out, the rest of your party could finish combat and then your character would get back up.
But BG3 plays by D&D rules so when a character is knocked out he/she starts making death saving throws and if the knocked out body is hit by aoe attacks or whatever those count as failed throws. If the body is left alone then every round the character rolls a D20 and anything under a 10 is a fail...on 3 success rolls the character is stabilized and can get back up after combat, on 3 failures that character dies and will need some kind of resurrection magic to be brought back though if your character dies in BG3 I think you just go back to the last save or checkpoint, I am not sure if you can even have someone come and resurrect you.