Chin na is really underutilised in most kung fu systems IMO. They'll refuse to study any grappling, and then the first time they get thrown or sat on or manhandled they'll spaz out or freeze or just give up. Head in the sand, the lot of 'em. And then if they do train grappling they'll switch completely over BJJ, which is just as overspecialised in its own way, when there's a perfectly good Chinese grappling system they could use. This would work so well with wing chun, flowing from entering to trapping to locking and throws instead of just trying to tangle up the opponent's arms for more chainpunches and eye pokes.