Most of the time, his ego prevented him from admitting these things, but he couldn't possibly deny that Xavier was a great replacement as him.
He didn't appreciate losing his job to Xavier, but it was better him than someone else.
Of course Xavier would someday replace him. Emilio knew that it was inevitable. It would happen at some point, he just didn't know when.
So when it actually happened, it took him by surprise. But after centuries… He slowly made peace with it.
Well, not really centuries. Recently would be a more accurate way to put things. Emilio had done no retrospection the past few centuries, he had only done it recently. And by recently, one meant when he discovered Madeline was his daughter.
And when he discovered Madeline and Xavier were mates as well.