One of the toughest things to do in these dogs, as well in a lot of other areas, is cutting your own path. My first experiences in the dogs was with a guy who did the things the way they were done back then. He was winning. As I got older I started to see other people doing things differently than him (complete opposite) and winning the same. I saw guys who had to skull drag dogs to see if they were worthy of being bred, then the polar opposite of breeding well bred dogs on their first or second heat. Both of these types have successes. I have known guys who thought the only way to condition was via the slat mill and the next guy would not let you melt his dog down and pour him on a mill. Both won.
The funny thing is that these guys lost too.
There are no real absolutes in the game just some general rules of thumb.
Red boy dogs are suppose to be long winded and game. Some red boy dogs bite shit in half and check up in 30 minutes in. Some red boy dogs are extremely athletic with a ton of brains and others could not poor piss out of a boot with instructions on the bottom. All these attributes could very well be within the same litter to varying degrees depending on the individual dog. Seeing the individual dog and what he possesses is the reason for looking, not necessarily to skull drag or game check or whatever the terms people choose to use.
Best of luck. EWO