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I agree with everything that you say... I was just pointing out that saying that someone installed the wrong GFCI because it's "20 AMP" isn't necessarily a true statement. Most GFCIs w/ NEMA 5-15R receptacle(s) are still rated @ 20A because 5-15Rs are permitted on a
20A circuit and it is often convenient to use a GFCI recep as the first one in a "string" rather than using a GFCI breaker. But if it has a true NEMA 5-20R recep then it was the wrong device but not the cause of the problem.nate