i dunno, but my instructor said, you shouldnt cross train too much because you'll end up forgeting movements. and when your in a street fight, you'll panic and cant choose a block fast enough... whether you use a WC block or Karate..u know what i mean?? but thats juz wat my instructure says, maybe he just wants me to stay with him. i personally cross train as well... i do WC and Vovinam (martial arts of vietnam) they are totally different. but like doing them. i guess its up to you