Ok, this might turn out to be a somewhat long post even for a chapter which was an absurd and remarkable as this one.
Rukia deserves the first comment. She got stabbed but considering the weapon riruka was using it does not seem like the wound was that severe considering how resilient spiritual bodies generally are. Interestingly, I don't think it is such a mystery was happened. Riruka has shown the ability to make people go into things she deems cute. It would make sense her ability allows her to go into things she deems cute (we could say we saw that in the flashback when she was in the box she trapped that guy she liked) as well so right now it would make sense riruka was by all intents and purposes inside rukia. Of course, it is interesting she deems rukia cute lol.
Now, the fight between byakuya and tsukishima was epic but not nearly as much as it was plain nonsensical. There is so much wrong with this fight that it is not even funny. The first part worth comenting on is tsukishima breaking byakuya's sword with his own fullbring. WTH? It was weird enough that tsukishima could keep up with byakuya in terms of sheer speed without any explanation whatsoever but breaking his sword is plain absurd. I know tsukishima knew absolutely everything about how byakuya fought but that does not explain how he made up for she sheer difference in speed. Tsukishima had enough trouble with fullbring ichigo, are we supposed to believe byakuya is that slow after all we have seen? Then there is the fact that tsukishima was not grossly overwhelmed by the sheer amount of petals of byakuya's bankai. WTH? Byakuya
here showed the ability to cover a HUGE area with his petals, even if tsukishima knows there is an area where the petals won't go to it still makes no sense that he avoided them. There is something which I found interesting though.
http://www.mangafox.com/manga/bleach/v51/c472/6.html
What did tsukishima mean when he said he improved by the same amount? Is it plausible that his ability extents to the point where his own power is affected by the memories he inserts into people? This would perhaps explain why he was so strong. He had the means to surprise byakuya by acquiring information from his zampakuto and setting a trap but in turn what ultimately would have made the trick to even the field would be to insert himself into byakuya's memories and increase his own power by training for hundreds of years with a shinigami. Up to now he would have only met humans so his training with them could only get him to be as strong as such humans but the shinigami detail would allow for a lot more. I do think that inserting memories into the building they were fighting on would contribute to his speed.
Now, the last part of the fight has some very remarkable features in itself. Byakuya won using the most basic thing you can do in a fight, improvise. It is quite remarkable that byakuya can be that creative in the spur of the moment, it shows that his versatility is by all intents and purposes never ending. Since tsukishima knew each and every move byakuya had ever thought of it does kinda made sense byakuya would win by coming up with something right on the spot though, I think that much was expected (I kinda did). I was still very surprised by how crude byakuya ultimately was. It was a simple punch with petals but still. The way in byakuya won does still have incredibly absurd features though. Pages before we saw tsukishima keeping up with byakuya's speed to the point where he could counter his shikai, keep up with his swordsmanship and break his sword and ultimately keep up with byakuya's bankai, something even a espada had trouble with. The next page we see byakuya jumping in and basically one shot tsukishima with a fistful of petals. If tsukishima could keep up with everything byakuya did until that point, why in the world was this a problem? Now, if we assume tsukishima derived an inherent boost from his memories with tsukishima it would perhaps make sense that byakuya using that was not in his memory would rid tsukishima of his boost right?
Now, given what we have seen of tsukishima I have trouble imagining him dying here. There is something off with that guy, I don't quite expect him to just die. I honestly think the next time we see them we are going to see byakuya contemplating ( lets face it, byakuya with his awesomeness does not stare, he contemplates) tsukishima's body and suddenly a weird non human reiatsu comes out of the body and we are left with a clifhanger with byakuya in disbelief. It really can't be that easy to kill tsukishima if the gingo scenario already suggest an undead state of sorts on their part.