The delay in implementing Najib Razak's house arrest has sparked a heated debate, particularly over whether the Attorney-General's Chambers (AGC) is defying a royal decree.

Yet the more consequential legal question may lie elsewhere.

Beyond the dispute over implementation is the issue of how the move could affect the calculation and enforcement of Najib's existing prison sentences.

What happens if Najib is transferred home today, only for the courts to spend years hearing arguments over whether his SRC International sentence had already ended?