The loss means nothing but every team have lost this season.
That's all

Duhhhh, old news, that's the 4-2-3-1, i can't believe you are just discovering the 4-5-1 ha ha ha unbelievable, everybody around the world uses it nowadays, even female college soccer coaches. Even brazil is the latest to fall in love with it. Geez you must not know anything about soccer. ha ha

Its also a defensive formation with 2 defensive midfielders, which arsenal does not need. Why do you think the world cup was incredibly boring last year? because everybody was using the formation, that's why there were hardly any goals. It was the greeks who made the formation trendy after winning the euros in 04. AC Milan has also been known to play another variation of the 4-5-1 when they still had sheva, which is specifically a 4-3-2-1, with three defensive midfielders, they also call it the "christmas tree". I hope Nigeria doesn't start playing like this.

That is another version of it, didn't notice the the full backs are also wingers. May be it does not show during the Game