I dont know about the thika green project but usually(if not in all cases) when a buyer gets into a controlled development, they get one share of the management company, when the lease expires, the title reverts back to the management company and it is renewed.
The reason why you dont get a title in such a project is because the moment you do, the shared amenities e.g roads become the responsibility of the council and ends up being run down&stops being a controlled development.
The biggest reason why controlled developments will not be successful is non payment of service charge by the buyers, look at the many city estates.

Buyers get into projects at different times and bills must be paid. By the time the resident association is being formed, where will the money for paying the watchman come from? caretaker's salary,common area electricity bill etc. Getting into those kind of projects happens gradually, does that mean the 1st tenant should pay for all that before the 2nd one moves in?
Youd rather have a fixed charge with proper breakdown. When the management company comes on board and members feel its too much then it can be changed BUT if the service charge is incorporated in your sale agreement then that becomes tricky.