For saji fans: there's no longer m3 with jinbei joining and Yamato seemingly also join, now the new era of monster duo(luffy and zoro)
I am becoming increasingly convinced of the duoship Luffy/Zoro have (they've always had but Luffys opponents were just always far stronger). If Zoro stays on the roof, fights Kaido until the end, then in convinced of it. If he relegates back to ZvK, which is great in its own right, then I believe Zoro is part of the M4 with the other 3, while Luffy is the "Yonko".
That being said, I am one of those people that believes Shanks and Mihawk will be their final fights or at least one of them, and they are considered equal so maybe Luffy/Zoro have been always set up to be equal in a way.
Nobody is outshining Luffy though in his own story. Zoro is the sole exception back in TB, and it made perfect sense. Does Zoro pulling a Ryuuma on Kaido also make sense? Yes, I can see it, but am reserved for now. Chapter 1000 put the spotlight solely on Luffy, not Zoro