When people learn shikai, they learn the name of their sword.
When releasing shikai, they say some sort of action + the name of their Sword,yes?
Madarame Ikakku's ''Grow,Hozukimaru''
Kuchiki Byakuya's ''Scatter, Senbonzakura''
Kisuke Urahara's Shikai is the Benihime we all know ( ''Scream, Benihime'')
In Deicide 7 we see some more talking and etc.
AND we see this:
As we know, when people go Bankai, their swords get a longer name.
Madarame Ikkaku: Ryūmon Hōzukimaru
Kuchiki Byakuya's: Senbonzakura Kageyoshi
Both get a longer name
That WOULD lead me to the conclusion Shibari Benihime is Kisuke Urahara's Bankai, especially because he also seems to fire some new attack.
Now here come the three big but's:
1. The next page, this happens:http://www.onemanga.com/Bleach/405/16/
He says yet another name ( Hiasobi Benihime ) with another new attack.
Personally I don't think both of those ''name-extenders'' are names of an attack, but one can't have 2 Bankai's either. ( Unless Kubo Tite is smoking something again)
2. I've seen numerous threads on Bleachcentral's forums on what people think Kisuke Urahara's will be. Though I haven't seen a single thread about these points yet.
3. The Bankai of someone like Urahara Kisuke is something that should deserve a whole separate chapter (according to KT anyways). And here, Urahara uses it casually.
Your thought about this?