My personal submission is Kemba Walker in late December 2021. He’s in and out of the rotation early in the season then goes off for 40+ pts then got a triple-double in the next game. Averaged like 25/9/8 that week. 2 months later he’s completely out of the rotation and traded away in the offseason.
Kemba filled in for Luka for one game last year, scored 30 and he’s still out of the league.