I think its a bit overkill to give Luffy's crew two more members besides himself that will be on par/stronger than Yonko/Admirals.

Even if some people dont like it its confirmed based on Rayliegh/Mihawk that EoS Zoro will be = > Yonko/Admirals, thats why i believe that Sanji will be up there, being able to have a high-extr diff fight with them but not being able to beat them.
Zoro is destined to be above Yonko/Admirals. And Luffy's crew will be the strongest crew to ever exist, so it's better for Luffy to have as much top tiers as possible.
 
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