From managing the work to owning the outcome.
The seat changes faster than the person in it.
A GCC usually starts by executing well-defined work, and rewards the leaders who deliver it cleanly. Then the parent asks for more: own the roadmap, hold the P&L of capacity, make the calls. The seat has changed. The leader who was perfect for the first version isn't automatically right for the second.
This is the hardest moment in a centre's growth, because it isn't a performance problem. The delivery leader did everything asked. The role simply moved past them. Reading that early, and acting on it with respect, is what separates centres that keep climbing from ones that plateau.