Shai- has the MVP and would top what might be one of the greatest non MJ seasons ever by a guard. However, OKC is the team most likely built to last, so this feels like a window that will stay open for him compared to everyone else.
Ant- would have credibility with everyone who wants to crown him and this might be the only chance he gets to do this. Also he could only be the only #1 since the lottery to win his first title without needing another #1 pick alongside him.
Brunson- would become undisputed KONY with a title and would be NY's first title in the 4 major sports since 2011 (Liberty, Gotham and NYCFC have rings. Otherwise the city has gone through a wild drought). He probably has the most to gain because NYC will never let people forget about Brunson til the end of time. Only negative would be that the East sucks so much that Brunson make it back by default.
Haliburton winning would be huge for Indiana and would be a "suck my dikk" to everyone. The teams who passed on him, the Kings for trading him, his peers who don't fukk with him. The only downside is that Haliburton is the one whose title would be celebrated the least going forward. This doesn't make him face of the league or whatever or put him in the HOF or make him the best PG. It can solidify him as the top heel of basketball, basically Reggie with a ring. If he leans into that, then he'll keep Indy on the map.