They have won how many trophies in the last 5 years and just easily beat this Woolwich team 3-0 a few weeks ago. They came out like it was going to be easy and dominated Woolwich, it was really bad luck and a lack of urgency that cost them today.
Woolwich did nothing impressive today, they did not defend well, they were not set up to repel City effectively in any way. Maybe if they had shown something there would be concern but they have been poor since the restart and have won their past two games by luck getting badly outplayed in both. There is absolutely nothing in their team, play or tactics to indicate that they can beat either United or Chelsea. Just like they did against City and Liverpool they will need to rely on their opponents to come out flat and disinterested and get a ton of luck as well.
They were organized, pragmatic, took their chances well. If they got their chances, they have the quality in auba, Lacazette, and Pepe to score.