I ran some numbers through the Players Split Finder on Stathead, and 4th Quarter Kenny is not our collective imagination. The stats clearly show that at least in the first few weeks of 2023, he has been stuck at the bottom in the first half, wakes up in the 3rd, and lights the league on fire in the 4th.
Data links are at the bottom of the post. I agree that a 6-game sample is very volatile.