I think it is important to avoid the categorizing of people too prematurely. You indicate he refuses a professional business plan - when you add the word professional, my thinking goes to whether he objects to the mechanical (perhaps mindless) possibility of business planing? Maybe he is open to a more 'organic' style of business planning. I also agree with one of the other commentators in this thread: it is more important to look at the structure of the partnership i.e. what he brings to the game and does he do that in a measurable, accountable and timely fashion e.g. perhaps planning is not his forte.. but he can and will and does contribute in other ways - can that lead to a satisfactory and measurable success in the partnership may be the more important question. As always, open to a conversation, if you need more clarification. Kindest regards.