Need to check if stent is needed.

My father recently undergone a stent procedure 2 months back . He went for angiography test without any symptoms as his tmt came out positive for ischemic heart disease but doctor suggested to place a stent due to blockage in main artery. Although he did not suffer from heart attack but still as a precaution we thought of go with doctor's recommendation . Want to ask for a second opinion if the stent was actually needed or not . Also, He also now has severe weakness after stent placement and also he sometimes feels sudden sweating and restlessness.Is it normal after stent procedure. He was an overall healthy person without any other disease before the stent placement.I am attaching the angiography photos also for referenc