Answered March 3rd, 2019

Steven Adams is the first player in Thunder franchise history with multiple 20-rebound games in the same season since SuperSonics legend Shawn Kemp in 1995-96.

Who was the last Thunder player with 2 20-rebound games in a season?
Interpreted as:
Who was the last Thunder player with 2 20 or more rebound games in a season?