I do not think Dani understood your sentence ...Bob said being a good trainer is the ability to see a good prospect, or recognize that it's not a good prospect.
That's a great prospect from a young age.. very rare, as was my 4 month old Neapolitan Mastiff trying his hardest to bite a man at our front door. Just a baby pup. He was not fooling around and would have bitten him, no doubt.
But his best son, Mog, took until 18 months or so to show that kind of intensity and courage. Maybe even longer.
I have mentioned that at 5 months old, the first time I took Drago to the park he advanced on a guy that was walking up to us and the man stopped and turned around. I now believe (knowing Drago) he would have bitten him, but I thought it was very strange at the time.