User blog comment:Lia Schiffer/408: Deicide 10/@comment-44061-20100617194323

Yea I think Aizen has mentioned those two as greater than him in both areas. Urahara intellectually and Yamamoto in strength. While his recent advancement has made him stronger his intellect remains the same as he stated previously to Urahara. But we can only determine that Scientifically/inventively and that realm he is most likely smarter then Yamamoto whose skills lie elsewhere then then those pursuits.