Thanks for the quote - it's very insightful - I had read about the emphasis on the big toe in Yoshinkan (but I had mistakenly taken it for the big toe in the front foot for stability.) I will have to experiment a little with this.
Bernard, this is a complex issue. Let me offer some advice that the big-toe thing is somewhat valid, but it's hard to fully understand until you get there. I.e., my best well-meant suggestion is to just drop it and do more basic things.