My assessment of the team after transfer window...
Goalkeepers: Situation Improved
Fabianski would have done fine, but I'm hoping Ospina displaces Szczesny, as I really can't stand his dangerous plays in tense situations (3 opposition players pressing defenders? = Diagonal short pass).
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Defenders: Worse off
OUT: Vermaelen, Sagna, Jenkinson.
IN: Debuchy, Chambers
Here we are worse off in cover/depth, and in the case of the first team RB we are worse off defensively. What made Mertesacker work in our team was the work Sagna and Koscielny did to cover for his weaknesses. I think we will see Merts effectiveness go down with Debuchy, there have already been signs... but I just know from watching Newcastle and France that defensively his decision making and awareness are not on par with Sagna.
Some unlucky injuries could end our title "challenge" pretty soon.
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Midfielders: no changes in personnel (I only ignore Diaby on principle)
No improvement in defensive options, which doesn't leave us anywhere better against top sides who bullied and humiliated us last season.
Plenty of cover in CM and AM positions, the key here will be how Wenger uses them. Hopefully it won't be anything like how he's trying to force Ozil on the sides.
An anonymous twitterer recently illustrated perfectly how he's making use of Ozil:
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Forwards: Situation improved
Alexis Sanchez alone would make the changes in our forward line positive from last year. I'm just happy that Podolski and Cazorla will never again play as wingers in the same game. That was some of the worst football I've seen us play in years.
As for where the goals will come from, I think plenty of players can contribute... but I think there will still be games where we'll be frustrated due to our one-dimensional tactics. And since Wenger isn't likely to get better at the tactical side, the situation would have improved if we had gotten a really clinical CF to help us get an early goal and change the pace of such games.
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Overall, I think our team is still physically imbalanced which will show against many opposition sides. Ozil as an AMF with Alexis in the team will be very exciting though.
But what will make us better against top sides that humiliated us last season specifically? I guess we have a higher chance to get an early goal to offset pressure now since we have some alternatives to Giroud?