That last part seems to matter a lot in the playoffs. We can also compare their rookie years and it's not really a discussion between the two. But who knows how Kessler develops. Gobert made huge jumps his first 3/4 years, if Kessler can do 1/4 of that he'll turn out better. But I also think we've seen most of what Kessler will be when he's played at his peak this year, but I hope I'm wrong.Yeah anything is possible.
Gobert is an all time offensive player though. I don't think WK can baby hook his way to being a better offensive player than Gobert. Plus there's the issue that WK probably won't ever develop the ability to get to the ft line that Gobert did. So in my estimation for WK to be a better offensive player than Gobert he will need to be a 75%+ ft shooter and be 60% plus from the floor with a shot diet that exist outside of 5 feet.
The best thing you can say about WK over Gobert offensively is that he is more trustworthy with the ball in tight spaces.