Have you consider having "vesting schedules" based on milestones?
This way nobody owns anything until they prove their work and commitment to the project.
Vesting schedule was commonly used with employees, but these days more and more Start Ups use it with their founders, advisors, etc...
Good luck!
Vesting schedule was commonly used with employees, but these days more and more Start Ups use it with their founders, advisors, etc... Good luck!