Do you think Eggman's schemes would change in any way if his grandfather was alive and knew what he was doing? And how do you think Gerald would react to his plans?
Are we talking about a context in which Gerald was sane?
Because if so, I strongly believe that Gerald would thoroughly disapprove of his grandson’s actions as a man of peace and ethical standards. I think he would exploit the regard that Ivo holds him in to convince him to follow in his footsteps and use his genius for good. And that if he held him and his accomplishments in any real regard, that’s exactly what he should do.