Quickfire question...

Who was Itosu's senior student?

a) Kentsu Yabu
b) Hanashiro Chomo
c) Kenwa Mabuni
d) Gichin Funakoshi
e) Kanken Toyama
f) Chosin Chibana
g) Other

I don't mean who 'joined' first, who was the oldest or who ended up with the highest Dan grade. I mean, if they were to all line up in order of seniority, who's at the head of the line?