Answered April 1st, 2019

Rudy Gobert is currently the first Utah Jazz player to average at least 15 PPG and 12 RPG in a season since Karl Malone in 1987-88.

Who was the last Utah player with 15 PPG and 12 RPG in a season?
Interpreted as:
Who was the last Utah player with 15 or higher PPG and 12 or higher RPG in a season?