Because all you can do is go on the here and now and it's the same reason why people are writing Man United off from winning the title. They've already started grinding out victories, Spurs, Palace and a draw at WBA so it's not like they've been battering everyone 5-0 and they're struggling to do the dirty work.
Like I mentioned in the last post, the tiring legs should start to ease over the next few weeks when they get several key players back which will allow them to rest others.
I dunno what it is, but it just feels like people are trying to bring up anything they can to try and discredit Arsenal somewhat. It's either, wait until they get a bunch of injuries (which they already have) or the only top teams they've faced are at home or none of the games they've had have been a true test yet.
I think the problem Utd have is that they have already lost three games and normally you can only afford to lose five, six max and hope to win the title. So even if they are went on a fantastic run now, chances are they would still lose another couple at some point. Its too early to rule them out, epsically with the league being so close, but I just can't see them winning it for the reason mentioned, and because they are adjusting under a new manager with freakly an avenge squad.
I see Chelsea and City as the favourites because of their squads, and Jose returning gives Chelsea an edge, but if they are still there or there about after christmas then I give Arsenal a decent shot.