I have never stated that anyone should drop the outside contact, I think you read into my post incorrectly.
You need to maintain the contact on the outside rein, BUT bring it off the horses neck. Having ridden and trained multiple young, green, badly educated and up to FEI horses, I have a basic idea of what I am talking about on the topic of contact and developing a reaction to the leg.
I would not tap the shoulder rather than behind the riders leg unless it was for a more 'interesting' problem then a basic horse not moving away from the riders leg. The problem is that the horse is not respecting pressure of the riders leg. By moving into the leg it is making that very obvious. I would always back up the riders leg (not the horse's leg, not sure where that came from?) with the whip, right behind where the initial aid came from. The point is to make the horse move away from the leg, and the inside hind is the first place to start. The shoulders will come later, but those hind legs are the vital ingredient in initially teaching the horse to move away from the leg.
Posted via Mobile Device