Maybe its just more curiosity that brings the younger bucks in. Primos has a video on their website, shows various bucks making these sounds in the woods..I believe it also shows one younger buck wheezing at a big 10ptr, and the 10pt gets right up to him and finally the youngin backs down.

I've also seen a video of a guy filming a nice buck roaring and every buck that was in hearing range starts coming in from every direction to check it out! was amazing. I would say that this is probably going to be a more effective call in bigger deer herds.