So, new info for new chapter:
Sodeno Shirayuki is considered to be the most beautiful zanpakutou in SS. (pure white and all) The reason Rukia wasn't seated was because Byakuya intervened and prevented it. The higher ranked you are the more dangerous the missions, and he wanted to keep her safe. (Awwwwwwwww!!!!!) But apparently she is powerful enough to be a high seat. (again we're not given an exact number)
And yes, Dee-roy was annihilated. Apparently he's the weakest of the Allancar, but it still makes for a plot hole. If Rukia took out an Allancar, weak or not, like that, then she shouldn't have been taken out by Fishbone in the first chapter so easily, Ichigo or no Ichigo.
In other words, Rukia gets to be cool and kickass. Yay! But now we are left without an explination as to why she got owned first chappie. Boo.