Might be an unpopular view here but I think Welbeck could turn out exactly the same as Sturridge. There are so many similarities. They have both tried at a big club and shown real promise but never really broke into the first team. They were both out of position which is a key reason they never made the first team. If Welbeck gets a run of games at striker (he defo has until January) then I think he could be very good. I can see him keeping Giroud out the team even when both are fully fit.
Also whilst Wenger has made mistakes I think he has shown he is becoming slightly more adaptable with playing Sanchez up top and playing Chambers at full back (and potentially centre mid in the future.) Also he has started to spend big on players (Ozil and Sanchez) and he bought a striker in Welbeck. I am not Wengers biggest fan but at least he is starting to change, much less stubborn that a few years ago. Lets not forget some of the players that have transformed from average players into world beaters under him and often they say it is largely down to him. He can have an amazing impact on some players.