I always figured they trained off-panel. Zoro commented a while ago that they were getting more powerful than they thought they were due to fighting, so the idea of Luffy improving himself as he fights isn't bad either, I'd rather significant gaps happen between battles though. With enough time and stuff.I would have loved some mini training arcs but I knew it was never going to happen so I threw that thought out of my mind a long time ago.
True, but it seemed like what was going to happen until this spoiler came about.
I wonder what this means for the other SN, I'm starting to think since Wano got delayed, Law and Zoro and the other SN are training somewhere on Wano as we speak. And by the time he gets there, they too will be much stronger just like he is getting stronger.
I would certainly hope so. I feel like Oda's best way of explaining it would be them training on their way to Wano and as they round up Marco and the other WB pirates. Maybe they're in hiding in Wano and secretly getting stronger. Would be pretty cool.