I understand the sentiment.
I had high hopes since Dressrosa for others SH's, mainly Zoro and Sanji, to be the ones dealing with the big baddies sometime to show their growth while Luffy would pursue other things, like the Mera Mera, helping stalling Big Mom in WCI, etc.
But no.
It was always Luffy's show and that's why I never expected ZKK to happen. It's just not how it goes.
A pity, I think the story could benefit greatly from expanding the other SH's influence in the arc's results.
The only good example that Oda did in this regard was Franky going for a solo mission to destroy the Factory.
Everyone else is basically filler at this point.