I think bottom line is that you need to figure out if the execution can be done with him, within a certain time period. If not, what are your other options. I

I think bottom line is that you need to figure out if the execution can be done with him, within a certain time period. If not, what are your other options. It seems like you don't want to partner with him. In the scheme of things, the absolute equity percentage is not that important (diminishing marginal utility of money). Also in the scheme of things, 1-2 years hacking isn't that much either. So don't make it about fair share. Make it just about whether it's a right fit or not. Is this person honest, hardworking, bright? Or is he a schemer, short-cutter, and a bullshitter? If he is the latter, just tell him straight up you don't think he has the right skills for it to work. If the former, have him start building things or selling to customers. Pretty soon he'll figure out on his own whether he wants to or can continue. Make it clear it's a valueless exploration period and don't sign any agreements until the project is more mature. Maybe he'll develop into a good partner in the future, without any obligation from you.