Chelsea have the squad depth to cope with any situation
It's well known that Chelsea have a superb squad, and today they proved it. When first choice goalkeeper Thibaut Courtois was taken off with a concussion, they simply brought on Petr Cech - the previous first choice Blues stopper for the past ten years. When they needed to be more physical in midfield, they were able to call upon John Obi Mikel, whilst they were also able to call upon Willian from the bench too, whilst new signings Filipe Luis and Loic Remy didn't even make it onto the pitch.
Eden Hazard makes a strong case to be considered the best player in the Premier League
Belgian playmaker Hazard had been considered as one of the top players in the Premier League during Mourinho's time as manager at Chelsea, but on the biggest occasion, he proved why he should be No. 1. The way he so comfortably glided past Arsenal defenders to win the first half penalty, and constantly caused Calum Chambers problems with his close control and mesmeric dribbling. Some can suggest the likes of Yaya Toure, Sergio Aguero or even Angel Di Maria, but Hazard has proven that he's the top dog.
The Mourinho-Wenger hatred is real
We knew that there was a certain level of hostility between Jose Mourinho and Arsene Wenger given that the Frenchman had never won a league game against Mourinho, and 'The Special One' famously called Wenger a specialist in failure, but today, things came to a head. After a strong tackle from Gary Cahill, Wenger and Mourinho squared up with a side of arm flailing, and there was no handshake between the two bosses at full time as the relationship becomes reminiscent of the famous vitriolic meetings between Wenger and Sir Alex Ferguson's Manchester United.
Diego Costa will go down as one of Mourinho's greatest ever signings
Last season, Chelsea's bid for Premier League and Champions League glory fell down because of their lack of striking options, which led to Mourinho forking out around £40m to sign Diego Costa, Didier Drogba and Loic Remy - and there's no doubting who the star of the show has been. Costa, a £32m capture from Atletico Madrid, has now hit nine goals in just seven Premier League games, including one against the Gunners today. At this rate, Costa will be the man who can fire Chelsea to success in the Premier League and in Europe - and that alone would make him one of Mourinho's finest ever captures.
Arsenal missed out on Cesc Fabregas
It was well documented that Arsenal turned down the opportunity to re-sign Cesc Fabregas from Barcelona, just three years after selling him to the Catalan giants. With Wenger preferring to use Mesut Ozil, Fabregas signed for their rivals Chelsea for £30m, and showed his class against the Gunners today. With 90 touches, 88% pass completion and one assist, Fabregas carved the Arsenal defence open - and how Wenger wishes he could say the same of Ozil today.