To be honest the Straw Hats are incredibly stupid. How many times has Zoro struggled badly because he lacks sky walk? Alabasta bomb, Davy Back fight, Oars, Hody Punk hazard dragon, Pica, getting to roof top, King. If he fought Enel today he would lose if Enel just stayed away and hit him with long distance attacks. Monet could do him in if smart.
But we know the generous Kinemon taught Zoro how to cut fire which saved Luffys life. They should spend 1 year on an island making sure everybody who can learns at least the basics of sky walk, soru, CoA, CoO, cutting steel.