Step aside, Nick Leeson. Get off the stage, Jerome Kerviel. If “Delta One” trader Kweku Adoboli really was responsible for blowing a $2.3 billion hole in UBS, then his chutzpah puts Europe’s past rogue traders to shame. But their shame pales into invisibility compared to the humiliation inflicted on Switzerland’s biggest bank. The acknowledged breakdown in systems oversight and risk controls is simply shocking. Every single Chief Risk Officer and every single non-executive director of every single “too big to fail” financial institution should be challenged by shareholders to prove they’ve got a surer grasp of risk than UBS.