I think Giroud missing chances is down to two things; he isnt ruthless/clinical and he is knackered. he's been playing up front on his own almost every game for an average of 80 minutes and is bound to feel tired and miss chances (esp late on like against Chelsea). I remember someone asked Henry about the 2-3 one on ones he missed against Barcelona in the CL final and he said "i had no power/energy, my legs were gone" as he played almost 80 minutes on is own. Bearing in mind Henry was much fitter and sharper than Giroud, i think we should cut him some slack.