Simply because they aren't the focus of the arc. You'll see when Xebec and Garp/Roger have one.
Now it wouldn't have much sense not only repicating someting already seen, but even put the focus on that. We had BB-Roger's moment, now is Garp's and Xebec's. And Roger's, after this.
Btw, I am not saying they are at their absolute prime. They are at 95% thought. 90 for WB.
We know their age, they already have their Powers, and we were told their prime was 2 years later.
People getting way too ahead of themselves, Roger vs WB is not the focus of the flashback of course Oda won't bother drawing a EPIC double spread for their clash when there already one.
No doubt Roger vs Xebec will look much more powerful based on Harald vs Xebec
Acting like I'm oblivious to basic narrative things. I get how Oda structures that type of stuff aswell and I understand it as much as you guys.
It's just that I think that you heavily underestimate the power gaps inbetween these top tier sub tiers, it's why I'm talking losely and calling them a bunch of low top tiers.
Talking about stuff like 5% differences doesn't do it justice, when we know from recent times that singular power ups can be a complete game changer for a character's meta: Both Luffy and Zoro upon learning to control their CoC utterly shit and will shit on their 1 hour younger selves. FS completely changes Katakuri's game f.e.. And there would be many more examples.
Same here: What if WB later on learns FS, Gura awakening and perhaps even an ability like ID CoA and he's therefore like 2-3 CoC boosts away from his actual prime? Basic Gura+adCoC and his herculian strength would still make him a low top tier atleast.
His portrayal right now and that Rocks subordination fall very short in comparison to his prime portrayal, the FB Roger clash and his future WSM title.
We also know from Sengoku that Big Mom grew much stronger in strength since then, BM, who's also subordinated right now.
I gave you the example of Garp, who canonly - 8 years later - only reached his absolute peak afawk.
Imo you guys underestimate how weak in comparison to their actual primes they could really be right now. Which would fit well with their, again, subordination and why Garp has such an big impact in the scene, who's likely a solid top tier already.
And if WB is the bottleneck here for the rest of the Rocks pirates, which he is, that won't do well for the rest of them and their GV opponents logically. It can easily be that there are only 2 or 3 Sky splitters right now on GV and that there are not 8+ 97% yonkou guys.