Cookie, I can't speak to exactly why DYS doesn't accept it, not being privy to their decision-making process, but I would suggest that it has to do with its very different factor structure and theoretical design. There is conceptual overlap at the level of some of the indices, but overall, it is more challenging to compare to the Wechslers or Binets, and it's not as commonly used as the Woodcock. All of the contemporary tests have some ties to CHC models of intelligence, but the KABC-II, though it offers an alternative interpretive structure that is CHC-friendly, is really based on the Luria model of intelligence, whose clusters are a bit different. Also, one of the design values was limiting cultural loading (aiming for culture-fair/free). As a result, there is limited information on verbal intelligence to be derived from it.
