You have to make a desision as to what the 'best' is. From the results of Red's breeding I would say she nailed it.
Lets take Dekka for example..
She has a very easy to live with temperament. She has proven that she will hunt (actual hunt) She is a JRTCC Trial champion, she has one the super earth class on a few occasions. She is a blazingly fast small dog on the agility course, has agility titles, rally titles, if I get off my butt and enter her in an obed trial (haven't in ages) she will have her CD. She has legs in Dock dog events. Dekka has such a fantastic temperament she always does the JRT booth at large events and is petted an mauled by litterally thousands of small children.
BUT She will never win a conformation class, yet is within the breed standard. There is deafness in her line.
So if she tests clean in eyes, ears, hips, knees etc should I breed her? I know there are eye issues and deafness way back in her lines.
I say yes as there are so many JRTs who don't do much other than conformation. To me a dog who can be such an all round dog deserves to pass on her genes as long as the risks of passing on anything are minimal.
AND there are NO CLEAN lines in the JRT breed. Until there is a genetic test there is no way to know if your dog is a silent carrier.