How the hell did he end up being the 6th espada?
OK, lets look at what happened. Tousen cuts off Grimmjow's arm. This leads to him being removed as the 6th espada.
Buuuut, why did Lupi become the 6th espada? The reason I ask is that there was 4 espada behind him.
7th: Zommari Leroux
8th: Szayel Aporro Granz
9th: Aaroniero Arruruerie
10th: Yammy (Yea I know he's technically zero blah blah blah)
Wouldn't Zommari become the 6th espada, Szayel the 7th, Aaroniero the 8th, Yammy the 9th, and then insert name here as the 10th?
Isn't that only logical?
That's just 1 part. This leads to a few questions. If Lupi is in fact stronger than 7-10, then why wasn't he an espada already? If Aizen has a replacement for Grimmjow that's at the level of a 6th espada, then does he have backups that are really strong as well just sitting on the bench?