Now I think you are just being rude and picking on KK. See I know for a fact, cause I read Blabbermouth, that Anvil invented metal and thrash metal. KK was around before Anvil and was no doubt playing his guitar before them but he didn't know what to call it because Anvil also invented words and terms. Once the rest of us were allowed to use Anvil's words KK realised he was playing what Anvil called metal. So KK actually copied Anvil's term metal because he didn't have his own words.
(Damn I need coffee after that!)