Luffy will be the strongest character in the verse, dead or alive.
zoro will be yonkou level (kaido type), sanji yonkou level (big mom type) yamato if he joins it will be the same in EOS
jimbe can still progress, although his growth rate is lower, in EOS he will be at least a YC1+, being that he is currently a YC3+ or borderline with a YC2
franky I see him at a solid YC2 level or bordering on the first commander level in EOS
so yes, luffy's gang will have 4 higher levels in his prime, which rocks never achieved, he didn't have 4 yonkous, but 4 future yonkou.
In addition to this, it will have two high levels.
yes, luffy's gang will be the most powerful in history, and hardly any gang can rival them