Well, according to all the current research, regardless of whether or not Rep was F2, he apparently inherited exactly the characteristics they were breeding for at the time. If you read the WolfPark article, it mentions how "erroneous" the "percentage" argument really is - a wolf-dog cross can inherit the "best" or the "worst" of both...
Perhaps the 50% parts Rep got was the best parts of wolf and GSD. Now, whether or not his offspring inherited that is the question. And some dogs are better producers than they are as actual specimens of the breed. Genetics is like throwing a bunch of dice in the air... you may have the same dice every time, but they won't display the same number every time.
One reason it's nearly useless to breed to a great "brother" rather than the great dog itself... just because they are littermates does not mean they inherited the same things... Also another reason tight breeding solidifies "type" - by narrowing the gene pool, you can "load the dice"... make it more likely to get what you want, and line-bred animals have closer genotype-phenotype...
I have Max v Stephanitz's book, too - very interesting and can't wait for the Karel Hartl book to be translated to English...!!!
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