How would getting knowledge from the Cerebro backup help? Knowing the pathway to a file on your computer is useless if you don't have the keyboard to...
I actually think he's not manipulating Hope, he does believe in what he says, the thing is she doesn't and either she'll buy into his hype eventually...
I guess Gillen wants it to come across as self realization.I do agree that it's been a fact of his power repertoire ,but then I was always surprised...
This can go two ways either Exodus is inspired by Hope and starts believing in himself for once instead of making a human mutant utopia in the guise...