Drogba was not offside

To declare my interest first - I'm a Chelsea fan.
Sunday's game between Chelsea and Man Utd was intriguing, if not particularly pleasing on the eye. Ferguson came to London looking for a draw, stuffing five players in midfield and squeezing as much life out of Chelsea as he could. The tactic almost worked, except for the Chelsea goal, which Man Utd have insisted should not have stood.
From my humble view as a refereeing spectator, this is what I saw.
1. Fletcher gets ball, then gets Cole. A clear reckless challenge, i.e. a foul. Free kick. Getting the ball when you also clear out the opposing player does not make it legal.
2. Drogba and Wes Brown tussle on the edge of the 6-yard box. Brown goes down. Foul? I've watched the replays but there's no clear conclusion. Yes Drogba has his hands on Brown but is Brown really so weak that he has to fall over? Centre-halves are supposed to be strong and the penalty box is full of this type of pushing and pulling.
3. Drogba was offside? No. Three points. Brown is on the ground level with Drogba so he is not in an offside position. Secondly, the only part of Law 11 that could snare Drogba is the part that says he was active because he was in an offside position and "making a gesture or movement which deceives or distracts" the Man Utd goalkeeper, who was stranded two or three yards away from the ball. Waving his foot at the ball didn't distract Van der Saar. If he had touched it, he might well have been offside, but he didn't.
And finally, assistants are coached that if there is doubt about an offside, they must give the benefit of that doubt to the attacking player.
So grumble as he may in yet another (successful) attempt to deflect criticism from his players, Ferguson and Man Utd are wrong when they claim the Chelsea goal should not have stood.
It was the gamble of packing the midfield that failed, not the referee.