Ranks caculate by elo. Your rank will go up as long as someone keeps having a higher elo rating then yours.
As for mine, lenshu, if someone got higher then my elo they would be rank 2 instead of me.
Here is the aikido.tbm elo rating you will need to get to get rank 1:
http://forum.toribash.com/tori_ranki...ame=aikido.tbm