Lehman Bros. didn't fail?

What? Shouldn't the association with a major failure in the financial markets be enough to disqualify Xavier Rolet as the cheif of the world's leading exchanges? I could be mistaken but I don't think that failure should be rewarded. Any key executive of a failed investment firm should not be in a position that has sway over such a large component of the world economy. Am I using the concept of guilt by association? Perhaps but remember he led Lehman's French business and before that worked at the bank's London office, handling relations with European exchanges. This makes him a key man in the Lehman Brothers operations. As such he is surely aware of the bank's activities and must have had input in the failed bank's strategy.  So while Xavier Rolet may be a sound fellow and even a decent banker, should the LSE be taking such a chance? Am I out of touch with reality or is the LSE? What do you think?