That's very interesting and completely believable. If I may ask, how'd you find this? Do you work at Amazon (is this known at Amazon, I would assume so)?
I am a seller and have to scan daily for competitors pulling this trick. From communication with seller support, it appears that Amazon is on the way to stop reviews from one variation to propagate to all product in the "family" as a way to stop it, but when it happens - who knows. More pressure from both sellers and customers should push Amazon towards it.
