I question that, two?

Yet you say you don't have mature bucks. Where are the bucks you Roared/Growled in? No shot opportunities? Do you really know what a Roar/Growl is or did you simply, "grunt" the bucks in?

Please elaborate on what exactly you heard, you can feel free to use the link provided in my other reply on calls and assist if it is not one of the calls available. Again, I have over 25 years in a tree, 20 plus years calling whitetails, I've never heard it so why all of a sudden is it a phenomenon?