Eggman's revenge would be a thousand times worse than Shadow's for the planet.

I'm not talking about "Damn Sonic, I'll get my revenge" revenge, I'm talking about something personal to him just like Maria was to Shadow, assuming there is a universe where Sage was killed by someone, that person would be VERY DEAD after do this, and for some reason I can see him when he's Mr. Tinker being EVEN MORE INSANE, if someone kills Belle, I can imagine even more insanity, because it's not something from past actions for him