@aFFi well they said that they wouldnt tell him "for now" cause they dont know how he will react because as you said he may not be able to controle himself (they are also protecting him that way ) i dont think they are trying to keep him in the dark for ever either, they are just careful since they dont know him very well yet no? its not a bad thing to be cautios and we know they dont mean harm and once he finds out how they think, he just has to act accordingly so they change as well and open up to him. This also means they just dont blindly trust him either cause they follow him out of their free will
doing something step by step and preparing is sometimes better than just dropping a bomb on him and let a catastrophe unfold and if they think that far that means they really care about him and consider whats best for him, its quite the difficult thing to do