The Bene Gesserit Plan

Okay maybe some book fans can answer this question for me, I’ve only read Dune and Dune Messiah right now, working of Children of Dune now.

But I am wondering if I’m crazy or is it kinda ridiculous that the Bene Gesserit thought they could create a being that can see both the past and the future and think they could control him? Like how could anyone possibly control someone with that much power? Also I what if he sees only future paths that they wouldn’t like? Based on what i understand from Dune Messiah Paul can only see paths of the future and can’t necessarily change the future too much if not at all. He can just lead to better timelines, but they too seem to have their pros and cons. Even if the Fade Rautha became the kwisatz haderach and they try to control him, I don’t see that panning out any better than it did with Paul.

What are your thoughts?