SystemShock said

According to pro-football reference, among active players, he's 3rd. Look who's 5th :hihi:

The thing about 4th quarter comebacks, the more you have, the more your team was losing late in the 4th quarter; and there is no list for 4th qtr comeback failures, they are just losses.

For reference:
Carr has 28 4th qtr comebacks in ~9½ seasons, or ~2.94 4th qtr comebacks per season.
Patrick Mahomes has 13 in ~6½ seasons, or ~2 4th qtr comebacks per season.

One can say Carr better at 4th qtr comebacks than Mahomes.
Or one can say Mahomes doesn't fall behind in the score in the 4th, and the wins speak for themselves.

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