Why do you think Miami is not a contender?
I like their team. Adebayo and Jimmy Butler is a great foundation to build off of. Lowry has fitted in as well as a vet leader and glue guy. Duncan Robinson is a dangerous shooter. Their young SG whose name I can't think of right now is very good. He is having a big season. Great coach. I like what they are doing and believe they are capable of making a postseason push. Their record isn't great but there is good talent & balance there. They are dangerous.
I have the Nets as the team to beat and Milwaukee & Miami as legit contenders behind them.
Philly are the team best positioned to join if they can find a suitable Ben Simmons trade before the deadline. If not, nope not a contender.
I don't think Miami is contender because they have some similtude with our 2017-18. Not with the style of players or even in game. But an outcoached team with elite management, with great defense all year and good 3 points shooting. But we hadn't LeBron in the east or SplashBro, Durant... And they are far to have someone like Giannis, Durant or Embid. Even Irving.
If I don't trust Philly it is because in PO their roster lack of talent, even improving. I don't see a big deal for Simmons, I see him more being trade this summer, even if I would be OK now to go after him (if we give them Brown, they become instantely contenders).
And if I doubt about the Nets, it's more about irrational, maybe because I don't like them. Maybe I just hope Durant will never be able to earn by himself the title, Irving never without LeBron and Harden never ever. Whih put them in all time ranking well under they should have been talent wise.
Afterall I feel like there will always have a worm in the apple (injury, cryrie stuff, Harden condition and downhill, PO game...).
So no for me Bucks are the only real contenders and Nets if everything turn in the right direction.
And yes I love also the Lavine/Ball tandem. I think Ball is a big miss. Smart would have been totally tradable, keeping some of his quality with having an elite PG. Saddly for a reason or another (maybe another player that don't want to join the Boston Celtics) we didn't push on him.