if luffy was not so egoistic, train everyone in advanced haki
"Show me the flowing haki! Luffy! I feel it...that flow will bring me closer to Black Blade! To have my sword sings full of life, just like that man..."
"Yeah, how about teaching us at least the steps to it? You seem to know a future a bit ahead as well."
"We need it to overcome the extreme danger of Emperor's crew and World Government!"
"Preach! Teach or be peach!"
Luffy: "Oh yeah i'll teach you it's cake! So you do make your fist like this, as hard as you can. Feel that something run through your something inside! Yeah like that!"
The others: " Something through something inside...do you feel anything?"
"I feel...my sphincter tightening..."
"Luffy can you explain to us a lit bit first since--"
Luffy: "Done yet? Good! After it runs to your fingers, now do a breathing through your punch! Relax and enjoy your punch now! So as you punch you breathe through your fist! No, don't breathe from the nose or mouth! Breathe through the punch, until the punch is the only thing breathing in the world!"
The others: "i'm DEAD SURE we cant breathe through a clenched fist. That's what nostrils, respiratory tract, are for."
Luffy: "Yeah you can yeah you do! You can breathe through your punch hey feel it now the flow strings getting together and form a new mystery color in your something inside! Not all you need to do is let that mystery color out! I'll punch the sky to be safe okay?!"
KABOOOM
After the moon turns into dust...
Luffy: "See?! That is Conqueror's Clad! Just do the same with your Armament! Breath as easy as you can through your fist or in Zoro's case you make your swords breathe! You'll get it somehow!"
The others with Andrew's Scott Moriarty's kiddie voice: "No y0u wOn'T !"