Successful teams are ones that have a core that usually consists of the goalie, central defender, central midfielder and striker and one of them tends to be the captain.
There are of course exceptions but I am talking generally here.
The successful Jose Mourinho Chelsea team had Cech, Terry, Lampard and Drogba, Sir Alex Fergusons United that won the treble had Schmeichel, Stam, Keane, Yorke, the Invincibles had Lehmann, Campbell, Vieira, Henry and Man City last seasons had Ederson, Laporte, Silva and Aguero.
Now, I accept that there were other players in each of those teams that were just as integral, Scholes and Giggs for United, De Bruyne and Sterling for City, Chelsea had Makelele and Mendes and of course, there was Pires and Cole for Arsenal.
And that is just a couple of players per team, there were more.
But those core players played the most games in the big seasons and had the most influence and it is very rare that a team is successful without that central core.
This current Arsenal team is not there yet but I would argue that in Leno and Aubameyang they have two key elements already and this season may see the emergence of the final two.
If Luiz can make the central defensive position is own and show the leadership he has shown before then Arsenal will almost be there.
Torreira could be the final missing piece if he kicks on from last season, as I believe he will and if he does then the core will be complete.
The core I am looking at then is, Leno, Luiz, Torreira and Aubameyang and if those four can boss their positions and make themselves indispensable to the team then Unai Emery can build around them and turn this Arsenal side into a very succesful one.