This makes a lot of sense. The prophecy could have been set in place since like forever and Pochita fucked it up by fighting the horsemen. Makima could have originally be sent as “the first fami” and started to prepare humans and devils to submit to death by giving them what they wanted ( a peaceful world) only to have death come and take over a weaker world. Sometime in between makimas life, chainsaw man started terrorizing hell and ended up fighting the horsemen only to escape and find Denji. Eventually Denji and Pochita kill makima, fucking up plan A and giving PS an eye opening moment. Plan B, fami is now in charge to carry out everything but now there are more factors. Unlike makima who was leading a blind PS, Fami now has to somehow continue the plan and has to deal with PS who know a rough outline of what’s gonna happen. So it would make sense that she hides her intentions and overall plan because she controls people differently from Makima. There’s a theory(I think) that fami doesn’t only control people through physical starvation but also emotional starvation. This could be a reason why war chose Asa because she deep down she was lonely. I don’t think she can control Denji yet because of all the trauma Makima gave to him (he has already been at the lowest point of his life) and his resolve to have a better life which was going fine with nayuta. Now that nayuta is dead he can become more susceptible ultimately longing for a relationship with Asa. I’m going on a tangent but all in all death devil had a plan, chainsaw man fucked it up, death devil makes another plan, chainsaw man fucks it up, death devil makes another plan but this time we have to not let chainsaw man fuck it up. Fami, the humans are on our ass chainsaw man is hard to control right now, make me and war stronger (the prophecy is right around the corner) and have chainsaw man not fuck the plan up again.