Oh wow. It's been a long time since i've been here. But anyways, i know it's a bit off topic but Yoruichi was NEVER EVER a captain. If you read ch159 again it will say that she was head of the executive militia or something like that. She has captain lvl abilities and all but never a captain.

Originally posted by: Chaoskiddo
from what i see isshin cant be a number of captains

11th: zaraki KILLED previous 1
13th: he was 1 of yamato's first students
8th: also yamato's first student
2nd: it was yoruichi than soifon, besides that fighting style doesnt suit isshin
1st: yamato has always been there
5th: it seems isshin knew aizen when he was at SS so i'm guessing they were both captains at the
6th: byakuya has been there longer than isshin left i think
4th: isshin a medical shiniagmi? my ass
12th: there were only 2 research development leaders, urahara then...shit i forgot his name. krotchski?

this would leave 3rd, 7th, 9th and 10th.

i'm riding on either 3rd or 10th because it seems like the 7th and 9th captain joined together and rose to captain together.

3rd is possible because we saw that gin was a VC before he was acctually a captain
and
10th is possible because we all know hitsuyaga couldn't have been there very long.
I agree with you completely except about the 2nd and maybe 6th squads. Isshin most likely left with Urahara and Yoruichi. Like i just said, Yoruichi was never a captain so Soifong became a captain after Yoruichi left. So that means we don't know who was captain of 2nd squad before her. As for 6th, i'm guessing if Yoruichi is old enough to call Byakuya "little" that would means when she was still in soul society, he'd probably be a little kid or a teenager.

Edit: Oh and Yoruichi doesnt have a Zanpaktou (^_^)