That they cant practice on a high bar - cant transfer what they have learned to the pole ? Sorry, my experience tells me that they can - unless of course they are absolute dumb bunnies. A major problem seems to be that many supposedly great vaulting centres around the USA dont even have a high bar -even Slippery Rock did not have one until very recently.
Take a look at the images in BTB2 -book or dvd - or the Petrov gymnastics dvd Sean brown has available and you will see how it all fits together.

