User blog comment:Xilinoc/Ch. 575 - THE KILLERS HIGH/@comment-24153155-20140404002617/@comment-5693502-20140404193458

His fight against Tousen. If he was a complete idiot he wouldn't have worked out how to catch Tousen and would have thus lost the fight. How did he formulate his plan ? Through the monologues of his three subordinates, Yumichika in particular.

He has always been a very perceptive person, especially in battle. Granted he is no Mayuri but just because he decides not to comment or act upon it (because it's no fun) does not retract from his intelligence.

If you have ever come across the Negima! series, then Jack Rakan would be a brilliant comparison. Both love a great fight, both love to drag it out for enjoyment and both are a lot more intelligent than they put across, simply due to their battle-lust.