Well first of all I thought shepherds were shown on a longer lead and taught to move out ahead of the handler?? I've never seen a shepherd right beside the handler ever.

As for the stack, your hubby might have had better luck if he hadn't had to fish for the treat, causing Ajax to sit. Does he have a stand command?? As he was slowing down I'd have given him a stand command and used the treat to lure him. I wouldn't think he would be able to manhandle him into a stack like that at a show.

Sorry I'm not much help as I have never handled a dog in the show ring, but I have watched my fair share of shows and those are my observations.