im sure chelsea have also had their fair share of injuries, cole, bosingwa, cech, etc
not to mention the biggest one in essien.
Man.U. also have the benefit of having one of the best managers there's ever been who knows the PL inside out & how to play certain teams whereas Chelsea have some n00b who's been caught out a few times tactically and has a feral left eyebrow.
Agreed we've been poor in the games where we could have taken a commanding lead in the title race. Though our record against Arsenal, Utd and Liverpool is impressive...6 wins out of 6.