I want to know the answer to the following question:
Which Orthodox leaders are free to adapt canon as required?
All the background I'm provided with is that "Some Orthodox canon scholars point out that, had the Ecumenical Councils (which deliberated in Greek) meant for the canons to be used as laws, they would have called them nómoi/νόμοι (laws) rather than kanónes/κανόνες (rules), but almost all Orthodox conform to them.". Is that enough to answer the question?
Answer: no