They loaned them Benayoun the other year, not worried about them I guess.
I know they have Mourinho and a better squad on paper, but there hasn't been that much between Arsenal and Chelsea these past two seasons.
I think Mourinho is going to screw Chelsea over. The fact he has benched Mata already just proves he's very stubborn. He's their best player and they still don't have a quality striker even if they have depth there.