User blog comment:Xilinoc/Ch. 683 - The Dark Side of Two World Ends/@comment-3430033-20160721141457/@comment-27001684-20160721170739

Aizen himself didn't seem to know what illusions he created and was surprised that Yhwach mistook him for Ichigo, the Renji illusion (if it was one) most likely came from Yhwach's own mind (he has seen his Bankai in the future).