Yo, this is some real good development for Sensei. He really found something to live for. And he broke away from Sacchan's toxic personality. And I'm pretty sure this "double suicide" was originally her idea.
It bugs me that the people see Griffith as a savior, and it'd be hard not to. Except we saw exactly what he did to get to where he is now. He stands on top of a mountain of his former allies, and probably doesn't even remember them.