[His eyes narrow, ever so slightly. Most would not even notice it, unless they were studying him intently. It's true, his zanpakutou is missing. The follow-up question however, and the far more important one, is whether that was due to Aizen, or some other, alternate force.]

Kyōka Suigetsu is said to exert absolute control over the senses. If you wished to conceal Senbonzakura from me, perhaps it would take the form of that creature. Or a blade of the grass.

Yet the bond that exists between shinigami and zanpakutou is far deeper than any outward perception. It's presence would still be felt, within.

[Of that, he is certain. It is not simply missing, it does not exist here. Something Aizen should not be able to do, unless he levelled up again.]