Board Thread:Questions and Answers/@comment-27210738-20151113205526/@comment-1970092-20160603044119

Uhhhhh, Aizen had Reiatsu twice as strong as the average Captain. Don't you recall Gin's soliloquy about how Aizen isn't strong just because of Kyoka Suigetsu, but because he is simply stronger than everyone else.

On topic, considering Ichigo has significant power in his current form which is still only his Shikai, I'm almost positive that his Bankai will of similar strength to his Dangai self.