I can understand the op to a degree, as I have felt Dzeko is your stereotypical confidence player and dropping him when he was bang on form has not helped. He did himself no favours at Bayern when he came off, although we are lead to believe that's all water under the bridge.
However, that said, and the lead may now just be goal difference, but being unbeaten at home in 2011, top of the pile going into 2012, having an FA Cup in the bag, our first foray into the Champs League behind us, the Europe League to look forward to, the Carling Cup Semi Final to look forward to, an explosive tie against those bastards in the FA Cup to look forward to and the real chance of actually winning the league an I'm not sure I could deny Mancini a ride on my wife and the very meagre contents of my bank account, let alone question the wisdom of dropping Dzeko.