Hackle feathers look long -because he was poorly muscled in breast area. I like big breast promoting the low station look which I associate with speed and power or the wings. The ideal birds for me have the impressive vertical take-off ability and the ability to fly longer distances very fast. The short sickles is typical for my strain. Bullstags are easy to distinguish from cocks based on sicle feather development. Exception to that involves early season hatch birds that come very close to the cock look as bullstags.
I would have culled him based on feel alone except for fact he is an exceptionally good display bird that really gets on with public. He has filled out better now but still on the lower end with respect to weight which makes him easier for kids to hold.