Re: Alternative Method fo Sankyo
Sankyo-nage is a good exercise for learning to apply sankyo into the shoulder. Like just about every lock in aikido, it affects the entire arm.
Alternately, a sankyo takedown. I've noticed some variance between schools; I'm talking about the textbook Yoshinkan-style takedown to pin. The pin itself also clearly shows the mechanism that applies pressure into the shoulder.
I agree, though. Sometimes people start tip-toeing and turning long before they have to. It creates an artificial disconnect. Anyway, I'd recommend working the (classical) pin and the throw to better understand this.