I understand it's difficult to accept that someone more senior than you (and possibly paid better) produces less value - it just doesn't sound fair. Maybe there

I understand it's difficult to accept that someone more senior than you (and possibly paid better) produces less value - it just doesn't sound fair. Maybe there's more than meets the eye, or maybe you're right and there isn't. But in the end, it does not matter. Focus on your work, not his (lack of) work. Proceed as if he didn't exist. Do your job the best you can, and make sure that the founder understands where the value is coming from. If they do, problem solved. If they don't, then either you're right and they don't deserve you, or you're wrong and you don't deserve them.