This bit is going to come out a bit blunter than I mean it to, but there's really no way around it. Dead people cannot actually play Quidditch, George.
I also point out that you were replaced as Beaters as soon as you left Hogwarts. That's actually how these things work. People finish school (or don't, but leave anyway), and new people fill in their spots.
And with multiple options to choose from, as Captain of the team, I have the right to choose between them.