Is Ja Morant that far from being the best Grizzly ever over either Gasol or Mike Conley? You can make the argument that since none were ever superstars and Morant has had the best seasons (arguably) with team success that he could be it. But press me to vote and I would go with Gasol as of now.
I looked at things from a further perspective of which teams have a player who while not there as of now could reasonably be the best by the time their career is over.
In terms of likelihood (highest to lowest):
Memphis - Ja Morant vs Conley / Gasol / Gasol : As discussed above
Dallas - Luka Doncic vs Dirk Nowitzki. (Obviously its not close now, but Luka's peak seasons to date are arguably better than Dirk's)
Phoenix - Devin Booker has a chance. Phoenix despite being in the league for a long time has no easily identifiable long term franchise player. Booker 2 years away from being the franchise leading scorer. In terms of quality the Suns greatest player is probably Steve Nash.
Charlotte - Lamelo Ball vs Kemba Walker?? - Not sure who the best Charlotte player ever is, and I'm not thinking it will end up being Lamelo Ball, but its not out of the question if he steps up his game.
Bradley Beal may end up as the Wizards leading franchise scorer by nearly 10,000 points if he plays out this contract in Washington. But I can't see him being seen as greater as Unseld or Hayes.
I thought about all of those as well.
I'll start with Dallas to combine this with the Kyrie trading. Luka at his best is better than Dirk, but Dirk did win an mvp, a title, made 2 finals, and has a statue in front of the building. If Luka spends like ten years or more with Dallas I would say he will definitely pass him, but I think we can now officially put Luka on the clock for a trade demand, so... (yes i am projecting a bit here, but sue me)
Memphis: Ja certainly looks like he will be the guy here. Probably another couple of seasons? A finals run this year could be enough.
Charlotte: Is definitely Kemba right now. Ball has a good shot of passing him.
Phoenix: Right now you're looking at either Nash or Barkley. Barkley wasn't there for too long, but he did win an MVP and take them to the finals. Nash was the 2x MVP, though you could convince me he didn't really deserve either one. I can see Booker taking this one.
Wash: I agree with you.
How is Kyrie as a catch and shoot guy ?
38% on catch and shoot 3's this year. Prior year 41%, 43.4%, 45.9%, 45.4%. The best guys are generally in the mid to high 40's, so I would say very good.