I just fought iceshadow in a tournament just yesterday.
the match was really good though.....
I actually dont know who's the best. and belt has nothing to do with winning or how good you are.
siku, nut, ticux, grey, borgpunx, andthefish, MANtrain, werd, Iceshadow and Tabaluca are the top group in terms of skill at aikido.
I don't have a fucking clue who's THE best, but it's certainly one of them.
Everyone in that group would be able to win a 1mill wager in aikido against anyone not in that group without breaking a sweat as far as I know, though.