I think each of them will have a good amount of success as long as their respective organizations commit to placing talent around each.
For Luka - DAL has done well in this regard, with Kristaps...they could be a WCS team RIGHT NOW...maybe they can convince Greek Freak to come in future?
Luka is - IMO - the most polished of everyone here and by his presence alone makes his team good.
For Zion? Needs to work on his handles, shooting (3s)...grow into being a player where Coach Gentry can run the offense THROUGH...dude's ceiling is IMMENSE due to his intelligence and physical gifts....just needs to get used to the speed of the game and realize he doesn't have to bludgeon his way through his opponents - even though this is FUN to watch.
Anyone who can out - muscle PJ Tucker and Dwight Howard is special and that is Zion.
Also with Zion - NOH's FUTURE is BRIGHT...Coach Gentry is proven and GM Griffin will turn LAL (

) picks into gold.
Trae? I think ATL is moving in right direction with him, Collins and NOW Capela. Trae has some weapons to help him. Would love to see him work harder on defense but this will come. Not sure of how many draft picks they have but they could be a playoff team next year.
Ja? Electrifying...may be the best leader out of these listed (besides Luka)...has the gift of making players better just by showing up. I think MEM has overachieved a bit this year but their future is bright, considering Conley, Gasol and Z Bound moving on.
Jae's in a great place.
Tatum? In a position to win RIGHT NOW...has ALREADY been to the cusp of The Finals (2017-18)....can carry a team offensively..getting better defensively...worked on his handles, his upper body strength...great work ethic and NOT lazy. I can say this because of what he has become already. Blessed with length, skill and a maturity of someone that has perhaps been in the league longer than he has. I say this because he has experienced 2017-18, experienced the lows and confusion of last year, and is NOW spring-boarding into a GREAT season NOW and perhaps into June.
Jayson is HUNGRY.
Jayson has a GREAT team around him NOW...a quiet leader in Kemba that is supporting his growth...a brother in arms in Jaylen that is deferring to him a bit AND a now-wily vet in Gordon Hayward that is helping to glue this all together.
Out of ALL the above listed Jayson Tatum is READY to win RIGHT NOW...BOS has a puncher's chance for the next few seasons. The other player's success is limited - at the moment - by whomever is placed around them.