Gravis had been quite surprised when Manuel had suddenly comprehended several Emotional Laws and then the level seven Law of Emotions.
Something like that wasn't easy, but Manuel's mindset was probably one of a kind.
In a way, Manuel had also sacrificed himself. He had essentially killed off his old personality and created a new one. Manuel had essentially died.
The new Manuel was nearly identical to the old one, but he still had a slightly different personality.
Of course, Gravis kept these things secret.
Manuel probably had his reasons for keeping his power hidden from everyone else.
Maybe this was a scheme to lure in greedy people that thought that Manuel wasn't as powerful?
Everyone asked Manuel about how it was, and Manuel answered truthfully to some extent.
Manuel said that he had changed and that it was nearly impossible not to change after undergoing Samsara.
The best way was to accept one's change.