(4) A share referred to in subsection (3)(a) is to be in the proportion that the total of all the proposed ownership interests of the proposed principal units and proposed accessory units in the future development unit, assessed as required by section 177(7), bears to the total ownership interests of the balance of the development.
(5) As between themselves, the persons who are entitled to 1 undivided share in the relevant estates under subsection (3)(b) are entitled in shares proportional to what was, immediately before the cancellation of the plan, their ownership interest.