User blog comment:Godisme/Pure Speculation Thread/@comment-1853786-20100410043418

OK Gin lied about his bankai, in actuality he can create up to 13km worth of blades and just made it into one long blade to make Ichigo unsuspecting of his bankai's actual ability.

Oh and the reason Isshin left the Gotei 13 is this: He used to be the Shingami on patrol at Karakura town like Zennosuke and met Masaki there and fell in love, later he became so powerful that he became a captain but didn't want to since being a Captain would make it harder for him to see Masaki so he left to live with Masaki. This might also explain how he knew Ryuken.

And the reason why Rukia never got promoted to Lieutenant of the 13th division is two-fold: First is Byakuya didn't want her to and the other is maybe she didn't have shikai until after the Soul Society Arc.

That is about it for my speculation for today.