Planning for the Spring offensive would be my simply guess.
By the way, this guy's analysis may be tinged with some agenda. He's the former CIA guy who has been very critical of the administration's WOT. Left the CIA in 2004, if you know what I mean . . .
Not saying he's wrong on everything, but I read his stuff knowing that he has some axes to grind.
I saw who wrote it...he does seem to have an agenda.