Oh, well, I can possibly explain, but I'm just a member here so I think a moderator would be better to explain the story. I think what happens within this plot is that Juhai and Yamamoto face off like they did in the manga, but instead of having them both live the conflict between them kills them.
Skip 1000 or so years later and you get Aizen who is with the 12th Division and Mr. Hat and Clogs developing Hogyoku. During their attempt to test it, Aizen is there when it goes out of control and it kills him. Mr. Hat and Clogs escapes this and Kurotsuchi is put in charge of the 12th Division. I think this means that the Vizards under Shinji Hirako are not formed, but I may be wrong.
Anyway, Baraggan takes over the Hueco Mundo and makes himself extremely powerful and somehow during this time a new form of Vanderiech forms as well, maybe actually before this. All in all I think all the same factions as in the manga exist, but with totally different leaders, and as a result of what it says about the Blanks, I believe those are our first enemies for the role play since they escaped somehow during this chaos or way after it and are attacking the human world and Soul Society soon.
Thanks for the compliment on the avatar. I was looking for characters who had a Soul Reaper feel to them without losing out on the uniform design. He fit the bill the best.