Start with going with 50/50 on business he brings to the table. This way you can work with 10 guys like him and evolve accordingly. If he insists on 50/50 lega

Start with going with 50/50 on business he brings to the table. This way you can work with 10 guys like him and evolve accordingly. If he insists on 50/50 legal contract upfront (which is not unreasonable if he's the star), add the minimal yearly dollar amount clause of the business he brings in.