As far as I know, it goes like this: - There are 4 escaped prisoners and you create 1 of them.
Where do you have that from? Any source? I can't remember that I ever heard that it will be that way...
But if that's really true I would be EXTREMELY disappointed. That would make "companions" even a lot worse than those in DOS and I actually don't think that Larian would do that, literally beating SP fans in the face (>80% of their actual customers) just to enable certain things in MP...
I do hope that "companions" for DOS 2 will mean that we can choose from various available people, just like in the traditional Bioware CRPGs. If there is anything that works in their games until today, it's the party creation aspect (a lot of people play these games almost exclusively for that aspect, me pretty much included). If there will really be only three pretty random "companions" that will start with you in prison the SP would indeed be a ton worse than MP - by design. I do ardently hope that this is not true though...