I think Zain and Cody are the best we're gonna get of this game
This isn't meant to be a doomsdayer post, regardless of how I feel.
I loved the 5 Gods era. That's just the best this game had to offer, period. However, in terms of why this game is excellent, I think that ends up being Zain vs Cody.
Both of these guys not only play against each other the most, but they also have a really distinct humility of learning the game. When either of these guys are on point and in control, it feels so thought out and conclusive. It has felt like that before them, but these guys are just really willing to throw their ego aside and keep trying.
I think these two will be the gatekeepers for the next top players and maybe the rest of Melee. They're always willing to play.