I mean, I'm glad we've got our scapegoat, but Sotirio is better than Appiah. In addition to his speed he can be strong on the ball and he is also fit. He obviously listens to the coach, follows instructions to the best of his ability and puts energy in for the team. It's not his fault he's starting for us.
On simple statistics Sotirio has been involved directly in 6 goals with the Nix. Appiah got 0. Sotirio has the sublime occasionally in his locker. For a comparison David Ball has been involved in 11 goals. I know this is simplistic analysis, but a fairer one.