If any of you had doubts that transfer target Edinson Cavani would make Chelsea instantly-better, I'd invite you to take a look at this:
That is just exemplary forward play. Even though he's playing in a wide role here, he does everything exactly right. From the wonderful take down, to the cut inside to take out a defender, and the perfectly-placed shot, this is exactly how a forward should play. Whether or not you agree with his transfer, it's hard to argue that he wouldn't drastically-improve the Chelsea squad.
Look at that. His tracking back to win the ball and start the move, his run to put himself in a great position to receive Santi Cazorla's return ball, the second 1-2 with the Arsenal man, and the skill in the finish. That's why we'd be absolutely-mental to be even considering selling Juan Mata. He's a legitimately-world-class, if slightly-under-rated, player. He's just not replaceable. Can we get him working with Jose Mourinho yet? [Cavani too?]