So oden talked about young pirates that LEAD the new generation, the captains of the old generation, the yonkous facing the new captains that lead the young generation.
So what are underlings, failed smile users like kamazo and zoro doing here? They don't lead anything, even forcing them into the worst generation next to only captains like luffy, law, eustass makes no sense. They don't have the will to lead, they gave in to captains and went under them. This is about the biggest will of the old gen vs the new one.
Why are underlings fighting the captains when they should be fighting the underlings of kaidou and big mom, calamities, sweet commanders, flying 6.
Marco should be up there because he was the captain of the wb pirates.