I think we may have to be careful about saying 'this is exactly what it's for' or 'it isn't for this' as many of us have different uses for it, I watched Iain Abernethy's description and demonstration of it on his Bunkai Jutsu DVD which is a very practical and easy move to do. I've also been shown other non grappling ways to use it so I think keeping an open mind on any move is the way to get the most out of kata.