opposite experince here

My half-import is the sweetest cuddliest bear imaginable. Almost to a fault. The dog lives for love and is a complete whore for attention. The dog will alpha-roll whether you want him or not. Both his parents, also half-imports, are this way. The two pure American Akitas I've owned, while sweet and of great temperament and breeding (both are also CGC's), are quite a bit more stand-off-ish. I could not alpha-roll my Jordan to save my life. His trainer didn't believe me, until she spent half an hour on him and didn't get anywhere either. I don't have a particular opinion on splitting the breed, but my experience in combining them has been nothing but positive.