DD only "plays" with mature sound dogs so they will teach him. It is hard to find a pup that is compatible in strength and play style without any of them getting hurt somehow.
I practiced the same routine with WD and all he got initially from the older dogs was a stern "no, you cannot do that to me!". The result was that, when he was just over a year old he became the teacher dog to several youngsters and smaller dogs. I was very surprised at that level of "wisdom" at that young of an age.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015