God Valley was a representation of the TRUE and REAL top tiers of One Piece.
We have Roger, who we all very well know was Pirate King! That's basically top of the world. At least those will be the expectations from the reader when they see the title Pirate King.
We have Roger's rival and the most feared pirate crew in history: Rocks Pirates which includes the big Emperors the WG were afraid of, such as Whitebeard, Kaido and Big Mom.
Stussy turned into an old hag, they all aged, they are not at the full strength, but it's clear their mere presence in their prime alone would kill a shitty little admiral and the fanbase along with it.
Then we have GARP! He wasn't hyped for nothing. He is the man that refused multiple promotions. He's way above the rest of the admirals. They had to gang up on him and he still laughed - he will get up in 10 seconds obviously according to LadmiraL headcanon.
Then we have other big names such as Garling, Shanks own dad, the father of an Emperor that can annihilate an entire pirate crew in one strike.
The biggest threat is Saturn! That guy is still being downplayed by admiraltards, but he's absolutely insanely strong.
He could be a literal demon. Did everyone forget the cult that thought they were summoning Brook? The practice is very real in the world of One Piece. It's not clear if and how this was done in the past. However if Saturn isn't simply a big power house eclipsing the little admiral shits then he is an actual demon and it's uncertain how he can be killed with instant recovery.
There's no room for little shitstains in there. That's why the admiral wank wasn't in the chapter. Oda had to make it clear who the big players are.
We had the kids in there as a way to show the future big players. Ivankov and Kuma. Ivankov might have powers we haven't fully seen yet.
Ginny is foreshadowing something about Bonney perhaps. Will see. Bonney isn't awakened yet, there's a chance though.