True, but some of the other books are specifically designed and offer more material for that purpose. Much of the book other than page 37 (in newer editions page 38), just won't work for Jazz interdependence.
I also think that interdependence and reading are interrelated. In the real world, he'll have to just read the figures and figure out the interdependence to play them on the spot. To me, I'd rather not have to work first from Syncopation, then out of another book. I'd rather build both skills at once. Of course, if someone reads very slowly, or doesn't have a teacher, Syncopation can soften the difficulty until they're ready to take the training wheels off.