i voted for gaara, look at it this way from all the people his own age it took massive amounts of effort to get past his defence, if his defence improves with age and he actually TRAINS with some other stuff then he would be the master, he wouldnt even have to turn in to that daft arse racoon either. also if he became more tacticaly minded (wich we can only assume he would be after losing his first fight ever) then he could be much more devastating perhaps when someone hits the sand he could grap them straight away, not giveing them a chance in hell.