From the video
J.J. McCarthy has had a really interesting short little game in five quarters with New York...he's the most dangerous backup quarterback because he has tools, but he needs a clean pocket. When it's in chaos mode...he's horrendous...in a clean pocket with the tools that he's got, my goodness gracious, man, sometimes he just looks like a top-level starter
STACKED’s take
Elite tools but needs clean pockets; most dangerous backup with top-tier ceiling in structure.
McCarthy has shown impressive physical tools and accuracy in his first start with the Giants against Houston, accessing the intermediate middle of the field and making throws down the sideline with arm strength on display. Matt Harmon characterizes him as 'the most dangerous backup quarterback' because he has elite tools but needs structure—in a clean pocket he can look like a top-level starter, but in breakdown situations he becomes one of the worst decision-makers, staring down receivers and trying to muscle balls in. His ceiling is contingent on clean pocket situations; in chaos mode, he reverts to these bad tendencies that led to his struggles as a starter in Minnesota. Harmon projects McCarthy could look good in the second half of the season given the Giants' solid offensive line, clean offensive design under Matt Nagy and Greg Roman, and John Harbaugh's confidence-building approach.
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