Imo if a grey was brought up like a lurcher, got used to fences etc ..... Genral field knowledge why carnt they be a good companion in the field, stamina wise, if the dog is jogged and ran regular then the dogs stamina will improve, once the dog has a season under its belt I'm guessing that it would realise that it doesn't need to run flat out to catch its intended quarry, and pace it's self.
In the lurcher game folk want dogs from tested parents yet how many of these Grey's are actualy tested in the field ? My guess is not, most will be ex track dogs. Just my opinion tho
Atb jcm