Not only did you give him a "wise grandpa who wants to help MC grow" you also tethered him in such a way that he has no choice but to actually help Leonel without ulterior motives because he has been exposed already.
I mean, the sooner Leonel dies the sooner his enslavement ends. unless the technique forces him to want to help him, I don't see him wanting to help Leonel get to 8th dimension by any means outside what he's forced to do