I never really thought he was clumsy ... he is young and sometimes yes he makes tackles that is questionable but that is not because the tackle was clumsy its because his timing is wrong.I mean when you look back at the QPR match Luiz was compensating for the attacker in the front and was almost there every where in the pitch where we might have actually wanted our players to be ! I don't know if you guys would agree but I thought Luiz bought the spirit into the whole Chelsea team to push themselves to limit to try and get an equalizer. David Luiz lost his calm back there but it was mainly because of the crackpot referee. Even I was furious over the decisions that referee gave.