I have lot all my respect for my namesake...there I would like to be known as WilliamsFan from now on...I feel disgraced with the name of Edge on me...
It's not all that new. He broke it out in late '02 and nearly killed poor Kanemaru with it. It's quite dangerous and he would likely only use it as a super finisher in the future against someone who really trusted him in the ring. Kobashi is a Super Pro, but he doesn't want to hurt anyone or even risk that possibility, so much like past All Japan killer moves of yester-year that he, Kawada and Misawa used to "kill" one another with after nothing else worked but took their toll on the recipient and his future, the Diamon Head will likely be kept n storage, save for a very special occassion.
GlobalHonored is right, it's one of those movies kept for special matches only. Not only does the opponant have to trust Kobashi 100% but it's also a question of weight. Kobashi couldn't just pull that move off against anyone... Forget about it for guys like Tenzan or Takayama as they're too big.
i have a japanese wrestling game, King of Colosseum, and Kobashi does the Diamondhead move. My first reaction was that he messed the move up, but then I thought "since when do they have botched moves in video games?"
A clip can be downloaded from www.yucube.com but the moves thing is down at the moment (for me at least, i was able to get on at my friend's house last night). I have it if anybody wants me to email it to them