I mean...what's the problem?
Whenever Luffy and Zoro are alone, neither plays 2nd fiddle. We recently saw this on the roof and it has happened in Whiskey Peak, Water 7, Fishman Island, Punk Hazard, DR and Wano.
Whenever Zoro and Sanji are alone, neither play 2nd fiddle. We recently saw this against King and Queen and it has happened in Arlong Park, Loguetown, Long Island, Enies Lobby, Thriller Bark, Return to Sabody, Fishman Island and Wano.
Whenever Luffy and Sanji are alone, neither play 2nd fiddle. We saw this in Skypia against Satori and in WCI against BM.
Whenever all 3 are together, they perform similarly with Luffy usually taking the lead. We saw this in Loguetown, Enies Lobby, Return to Sabody and Fishman Island.
If you use scenes of Zoro and Sanji together to call them equals, same applies to Luffy-Zoro and Luffy-Sanji.