Arsenal's attack doesn't make them a championship contender without Olivier Giroud and Theo Walcott. Arsene Wenger must add another attacker and forfeit the idea of having Alexis Sanchez play center forward. Sanchez is a flank player, and I can say the same thing as Walcott. Giroud is stronger when he's an air player, but he lacks pace and isn't reliable in front of the net.
Wenger's attempt to solve this problem has been frustrated in the offseason. Wenger couldn't sign Jamie Vardy and Alexandre Lacazette. However, the market for a striker has plenty of star players.
The top player to sign is Julian Draxler. If this signing were to happen, Draxler represents a major upgrade for the Gunners. A few years ago, the word on the street was that Arsenal was going to sign Draxler for 43 million Euros.
If Draxler does indeed sign with the Gunners, I see him as a central striker, much like what Gunner supporters saw from Robin Van Persie. It's a great plan, considering that Draxler and Van Persie have the same playing strategy.
Draxler plays the flank and attacks through the middle, so I believe he'll have a smooth transition. Draxler has the technical acumen, pace, eye for goal, and impudent flair. If Wenger is ready to sign Draxler, Wenger has to spend on what could be a game changer in the future.