They may be in peak but I think Roger and Garp grew a lil stronger after God Valley to become fully high top tiers
Rocks pirates are just monstrous
To be able to fight Saturn, Prime Roger, Prime Ray, Prime Garp, Prime Kong, and Garling...yet only Xebec and Kaido end up losing, is something crazy
Maybe they all got some haki bloom due to God Valley, but physically they should be at their peak IMO
I used to think it was crazy Roger and Garp did it back in the days, where just Rayleigh and maybe Bogard were the only other notable allies.
Now we see the allies were stacked too, with Saturn, young Garling (probably scaling to Shanks) added to the mix.
Was Kong ever mentioned though? Edit: just read the new spoilers
As things are looking now, it seems allies are more top heavy.
3-4 top tiers from Rocks side - Rocks, Whitebeard, Shiki (he around same age as Roger, I presume he's at his peak), Big Mom (?? she was 30, so maybe 70% her peak? Could've peaked early also)
4-5 top tiers from allies - Roger, Garp, Rayleigh, Garling, Bogard (? depending on his age)
I presume the rest of Rocks crew cancel out with Roger crew and other holy knights.
It becomes even worse for Rocks if Kong also came (Sengoku probably wasn’t there given how he explained the events to young marines).
Rocks probably will be shown as an absolute monster in this flashback if Kong is also there, that's the only way for the events to make sense
Edit:
Insane since Kong is there. 5-6 top tiers in allies side. Rocks should've been a monster amongst top tiers to give them a run for their money