I agree with this, except for the fact that i think all three would be great alongside Luka, Harden or Lebron
I think all 3 would do well, I'm saying AD is best suited to have one of those guys.
Fit is relative.
Embiid needs a specific type of support cast to fit around him; one that gives him the appropriate spacing, ball-handlers/creators and depth to balance out his foibles. Whereas you can quite literally throw any type of player around Jokic and he'll make it fit. He's pretty much the Steph Curry of bigs.
All players benefit from having the type of things Embiid's team is lacking in - floor spacing. It's not like Embiid is looking for some rare player archetype next to him, it's the basic stuff you'd expect on any good team in today's game that the Sixers have just blatantly failed at providing. Jokic is an overall better offensive player than Embiid and more versatile, I'm not denying that, but I think his passing is why he can fit with more and is more versatile, not because he's better at creating his own scoring opportunities. If Embiid had floor spacing around him like other great players he'd be much more dominant than he already is.
When it comes to creating one's own offense, creating scoring opportunities for yourself, I think Embiid is better than Jokic. Jokic has the overall better offensive package because he adds creation for others, but Embiid's defense, considering Center is still the most important defensive position, makes up for that.