Jokic is the best offensive player in the league right now.
I think you are selling him short by saying he was the best offensive player. Imo, he was the best
offensive player in the NBA last season. When all is said and done, I believe he'll be considered a top 6 Center of all time. Possibly even higher than that depending on how many ring(s) he wins (if any). That said, I think Luka will become better than Jokic for 2 reasons:
1. Luka is only 22. The sky is the limit for him.
2. Not all positions are equally important when it comes to defense. It's easier to hide a (s)wing on defense than it is to hide a Center. It's even easier to hide a Point Guard. The opposite goes on offense. It's easier to hide an abysmal offensive Center (for instance, rim runners) than it is to hide a (s)wing. It's practically impossible to hide a Point Guard who cannot shoot the ball. Look no further than Ben Simmons, which is why I wouldn't use him at PG in the half court. Jokic is a PG on offense and a Center on defense. In a vacuum, he's a more effective defender than Luka, but he plays at a key defensive position. You guys keep complaining about Luka's defense. In fact, it's relatively easy to hide him on defense.
It is one of the complaints I had with IT4 and Irving when they were in Boston i.e. great offensive players (and Luka is way better than them), but horrid defenders (luka may be worse than them).
Come on man. Are you seriously comparing IT4 to Luka? IT4 was possibly the worst defender in the NBA. Luka is nowhere near that bad. All advanced defensive metrics suggest he's a passable defender.
Defensive Box Plus/Minus:
+0.6 (this is actually above average)
Defensive RAPTOR:
-0.8 (ranked 164th out of 250 players, so let's say a bit below average)
Defensive rating:
107.0 (ranked 319th out of 505 players. Again, a bit below average.)