accolade from 3 yrs ago? That's like a lifetime in the NBA. Compare their per 36 min and 100 possession rate stats. Compare their advanced stats. Kessler is better in nearly every stat already. Not saying Kessler is perfect by any means. His FT percentage stinks. Lopez does shoot the 3pt shot whereas Kessler doesn't but Kessler's TS% is much higher.
Try to keep in mind, Kessler is a ROOKIE while Lopez is in his 15th season. Also, Kessler's last 10 games (when he became the Jazz's starting center) have been very impressive. More than Lopez's last 10 games.
Point being ... Lopez is NOT 'on another level' than Kessler. Only 2 centers are 'on another level' than any others ... Jokic and Embiid.