User blog comment:Godisme/Hear.Fear.Here/@comment-5306073-20120718210744/@comment-1904799-20120718234548

I think Grimmjow is by far the most likely person to have cut Kirge in half. Aizen is still imprisoned, remember, and even in the midst of their current crisis, Soul Society would doubtlessly have noticed if he had somehow managed to escape. His zanpakuto is also out of commission. You also have to remember that Grimmjow was the 6th Espada, a much higher ranking than Loly, Menoly, or any of the Tres Bestias. He would stand a much greater chance of defeating Kirge, especially with Kirge as badly wounded as he was.