Arsenal 1-0 Chelsea. A good start for Arsenal to win trophies ?

On this Community Shield 2015, Arsene Wenger finally beat his long-archery rival Jose Mourinho, after 14 attempts (duh) by saw his team beating Chelsea 1-0, thanks to Alex-Oxlade Chamberlain, who scored the only goal in this match in 24 minutes.

With this victory over Chelsea, Arsenal have managed to win a "treble" :
1. Barclays Asia Trophy
2. Emirates Cup
3. Community Shield
(although those trophies are not worthy for while at all) ........

So,
why Arsenal can win this match, even though Chelsea have the more possession ?
Why this victory is consider meaningful for Arsenal ?
Why Jose Mourinho lost to Wenger this time ?

Based on my view, Arsenal definitely have changed a lot over these years. Unlike previous seasons, this Arsenal seems more flourish , more energetic, more ambitious.
You see, in those previous pre-season match , Arsenal have played in a very balanced form and a very technical technique known as "tiki-taka"(you better google it cause I really limited about this play style), which saw the players passing the ball each other with technical play style.
This play-style seems implanted in Wenger's play style and it's philosophy, but their stability for this play syleare still remain in uncertain.
Chelsea, however, seems still the same, neither nothing improved nor changed ,on this season .
Overall for those years since Mourinho in charge, they semms only attached to a only play style, by gather all the players into a defensive form, known as "park the bus" (Mourinho always did this whenever a match).
The main disadvantages of this play style is that whenever a player breaks the defence, it's hard for them to re-defend it again.
Which is why he would failed to defeat Wenger this time. (He could be humiliated by Wenger if Courtois didn't made those saves).

Compare the signings of both teams, Arsenal definitely are the winner.
Arsenal managed to sign Petr Cech from Chelsea, one of the greatest goalkeeper in Premier League or even Europe, while Chelsea signed "sick tiger" Radamel Falcao (oh sorry, is in loan not sign).
And when you see their performance on this match, you'll definitely knew which one are the better side.
Cech performed very well on the match by making multiple-saves, including a free-kick form Willian (or Hazard ?), although it's not even comparable to Courtois.
Falcao ? Haha, nothing changes.
He still struggles to get a goal, he still slips (is his boot made of banana peels ?)
What's changes for him ? His hair !!!

So, who will become the champion of 15/16 Premier League ?
Well, surely not Liverpool or Tottenham at all.
Based on the current performances of pre-season matches,
I think Arsenal and Manchester United can be the top contenders of Premier League, since Chelsea Manchester City are performed badly (which is a good news !)