Yamaji was a necessary sacrifice. The reason why the picture was there serves as an indication that Yamaji’s Zanpakuto is not really just a Zanpakuto. My theory is that, much like the ‘Diamond Dust Rebellion’ OVA of Bleach, Zanpakutos are real beings sealed within the swords. Hence, the idea of a ‘flaming god’ cannot be too farfetched considering the fact that Ichigo achieved a full ‘bond’ with his Zanpakuto. So far in the manga, he is the only one character that has been known and shown to have done this. SO FAR. So the reason why Ichigo was placed under the 5 war potentials was primarily because research regarding such a thing never really happened AFTER the extermination of quincies 1000 years ago since (I’m guessing…) the people who could fully bond with their Zanpakutos vanished. (Into Squad 0.) Hence Yama said that, if that happens, he will no longer be there because that was the cue for the return of Squad 0.
I honestly think that Yamaji is not that weak and stupid. He made it look like he really wanted to end the war by himself but in fact, he knew he was a sacrifice that was needed in order for Squad 0 to come.
The incomplete picture to me here is the presence of Okikiba in the First Division Camp where Aizen is in captivity. CC Yamaji asked him to stay there and if Juha Bach claims that he had met with Aizen, what has happened to Okikiba? Is he dead? Or is he some guy that’s just supposed to report the status of the war to the Squad 0, much like that guy Philippides to the Greeks?
Our first glimpse of Squad 0 might actually come from Hueco Mundo. If Kubo shows them in the next chapter, that would be awesome. And of course, what we want. But that will have to wait. We have yet to know whose sword lies in the face of Urahara. And honestly, I would want to know that more than actually knowing the people who have the ability to put an end to this war and this arc – Squad 0. Oscuridad
It doesn't really matter to me the 5 he considered. He's pulling back when the zero squad are about to appear. This might be tactical, but you are only tactical when you have chance of losing. Hence, there will be several others of the zero squad that are very powerful that would certainly affect this list of 5.
Bleach Wiki mentions that He was originally set to appear in the manga during the same part in the series, but had to be cut by series creator Tite Kubo due to time issues.
He was added in the anime though ;).
Here another picture of him (from the anime):
If we were to assume that his story was more or less like that in the anime, then he might have participated in the war against the Quincy (thus might had a reason to kill of that Quincy). His current whereabouts would have been HM and he have the tendency to point his sword even at shinigami ;P.
Beside, I'm not sure if that can be Grimjow. Some people suggested that Grimjow was one of the bodies (materials) hanging out of that Espada's Scientist secret storage. If so, then naturally he would have been taken to Science Division of SS.
I read somewhere that chapter 512 would be postponed for a week or so, anyone know if this is true?