Referring to the Jaksa/Roder book. Why would someone make such a statement? Buy the book and find out.

The basis behind it is the fact that for OBR, at the time nobody had ever put together a comprehensive reference on rule interpretations - not even MLB.

People don't normally teach the rule book from a textbook point of view, going into all the minute details. If you get Roder's 100 problems book it explains 17 situations that can occur in MLB that are not even covered in the rule book. Rule books and case books change ever so slowly. With multiple references for any given situation, it is necessary to sort it all out. That's what the J/R manual does. I just got mine yesterday and am looking forward to reading it over and over.