Might have different opinion about Giannis, he already gained the title so why he should transfer to much stronger team?, why not ask or demand the franchise to bring him another star/s as they are the one who needs to defend the title.
But it's him to decide if the max and all the perks from Bucks ain't enough for him maybe we will see him leave and play for another team.
Players and scouts are now looking for good team to work with, the ball is on the team owners now to pick the right player to add
with their squad.
I don't know, I believe this is an important variable that needs to be discussed.
I think it's easier for Antetokounmpo to get out of the Bucks than to bring an allstar to Milwaukee.
For example, I believe it is more plausible for Antetokounmpo to go to the Warriors, Clippers or Nets, than Klay, Kawhi or KD to team up with Antetokounmpo in Milwaukee.
Which NBA team wouldn't want Antetokounmpo to play for their team? lol, pretty much all (or maybe most)
Of course, what I mentioned is just a mere example that can happen (and I don't doubt it), but for this to happen or not, we will need time.
Well, that's my humble opinion

You are basing what you are saying base on what happened this post-season where series are being determined by injuries (not all but most).
I agree though with what you said that a healthy big 3 of Lakers (LBJ, AD, Ninja Turtle Russ) and big 3 of Nets (KD, Beard, Kyrie with no ethics

) will most probably be the ones who will face into the NBA Finals. On the other hand though, its too early to predict at least because an injury from a superstar may change the performance of the whole team. Ohh I forgot lets not set aside the defending champs, Bucks who I think will not change that much in the core roster and I think that they will just be stronger coming into the next season and the Warriors who got Steph and a healthy Klay (hope he will not get injured again or else they will trade him).
On Giannis going to another team, I don't think that it will happen. He isn't like Kawhi where he got a champ on Raptors and he will find another team. I believe that he will create a super team around him. He will attract those superstars out there and he will not be the one to go to their team. At least this is what I believe.
Yes, that's because I think every team needs to have good reserves players to be able to take turns with the allstars, that makes all the difference!
An example of this was Lakers and Nets (in 2020/2021 season) and in the NBA finals, Warriors vs Raptors (2018/2019 season)
I believe that a basketball team is something similar like a chess, because every movement/attitude can bring excellent or bad benefits for the team and for the players!