It's possible if his arm is tired he relies on the curve far more. Or any hook. Would seem lifeless arm would clearly show up nor prominently on fast ball velocity, not something hooking. Industry experts Talking to DailyMail.com said the indications were 'non-unique' and so they needed more information. https://www.dailypioneer.com/2017/page1/99-mlas-swear-by-chinnamma.html