3 reasons why Lucas Torreira should be a regular starter for the Gunners 

#1 Contributes to the attack from a deeper position.

Torreira, having started his career as a No.10, can start the attacks from the deep alongside Xhaka

Torreira started his career as a No.10 before being rebooted into a Defensive Midfielder at Sampordia. He is extremely quick-footed with an ability to pick out the right pass. This facet of his game alone makes him an upgrade on the defensive midfielders Arsenal had in the recent years.

Francis Coquelin, though a proper midfield destroyer, was never the one to contribute to the attack. Flamini and Arteta, for all their influence and importance to the squad, were veterans with ageing legs.

Torreira's set-piece ability is a useful weapon to the Gunner's armoury

With Torreira at the base of the midfield, Arsenal has a mobile Defensive midfielder with a good passing range who can contribute to the offensive part of the game without neglecting his defensive duties. He offsets the weaknesses of Granit Xhaka, who was tasked with protecting the back four for the last two years even though he doesn’t possess the skills to do so, and enables him to dictate the tempo of the game alongside the Uruguayan.

Having two defensive midfielders with exceptional passing range allows the Gunners to move the ball quickly to Mesut Ozil and the offensive players like Aubameyang, Lacazette and Ramsey in positions where they can do real damage. Furthermore, his expertise in dead ball situations adds another weapon to the Gunner's attacking armoury.