>You say you're willing to walk away. Do it.
Given your first line, this sounds like a bad faith suggestion. Why should I walk away from something promising vs helping our team become more productive?
And given the context of the person in question, who was fired from the last startup for lack of productivity, I don't think this will do much to my reputation. My reputation is pretty good right now. Yes, I feel a little dirty about how this situation is going down, but it's not out of malice. It's out of wanting to work with excellent people and build an excellent product.