Can't exactly say I understand what a Soul Reaper captain is, but sounds similar to what we were told. I guess you're right, how could they decide every single choice we made. Maybe just nudged us to some of the bigger events. At least with the Time Masters they were able to see how things would change based on certain events happening. Main thing for me was getting on a ship with my sister's boyfriend and said ship sinking. I'm sure if the ship never sank I wouldn't have ended up who I am today, so maybe they just played a hand in that and what not.
I sure hope he didn't plan what stuffed animals you had. Don't think they could have done all that for me too.