Farmers while they were masters smart ass. It'd be interesting to see what economic status most masters came from. I believe Shimabuku father owned his farm and also a butcher shop. So was he part of the Okinawan middle class? Shimabuku also owned a small concrete manufacturing firm. So besides farming he was a business man. Just wondering as how much effect economics had on allowing some the time and training to master their arts.
Air punching is OK to check form, but I've noticed in schools that over do it how the punch looks is the goal rather than checking the body mechanics.
Some more info on Shimabuku