User blog comment:Xilinoc/Ch. 570 (I can't think of a witty title at 11 pm)/@comment-24572618-20140226225829/@comment-11051098-20140228163450

He could achieve Bankai at some point, but it might lie far beyond the point of time we will ever see in the series. Learning the name of his Zanpakutô could possibly unlock a few techniques he could learn, increasing his attack power, but it's doubtful he could learn Bankai just from learning his Zanpakutô's name.