It is very simple
Gents,
All this changes on Ghana schedules are caused by operating flights with one (1) DC-9 (Million Air) to West Coast.
Since there is limitations on flight and duty (South African CAA regulations), you cannot expect crew to fly out of duty to please Ghana Air and maintain schedule of 300 hours with two crew and one aircraft.
If they could introduce(??) another aircraft on their West Coast schedules, there would be no disruption to their 'published' schedules.
Gents, it is all about money - check their total debt up to now, and everything will be more clear....