The signings of Alexandre Lacazette and Pierre-Emerick Aubameyang are “Arsene Wenger’s biggest legacy at Arsenal”, according to Martin Keown.During his final season at the Gunners helm, the iconic coach invested heavily in two proven frontmen.Lacazette, who had been a long-standing target, was acquired for £52 million ($68m) from Lyon, with a further £55m ($72m) required to land Aubameyang during the January transfer window. Article continues below Editors’ Picks Man Utd ready to spend big on Sancho and Haaland in January Who is Marcus Thuram? Lilian’s son who is top of the Bundesliga with Borussia Monchengladbach Brazil, beware! Messi and Argentina out for revenge after Copa controversy Best player in MLS? Zlatan wasn’t even the best player in LA! Wenger was initially reluctant to use the pair in tandem, but experimented with that approach towards the end of the 2017-18 campaign.There were signs of encouragement, and new Arsenal boss Unai Emery has seen a devastating duo flourish as the focal points of his attack – with both men on target in Sunday’s 2-0 Premier League victory over Everton.“Arsene Wenger’s biggest legacy at Arsenal is the firepower at the top of the team that killed off Everton,” former Gunners defender Keown told the Daily Mail.“Wenger splashed out more than £100 million last season to bring in Alexandre Lacazette and Pierre-Emerick Aubameyang and they proved their worth in this victory.“Lacazette is simply ruthless. He may not have had many chances on Sunday but he made one of them count. There was no saving that ferocious strike to put Arsenal ahead.“The way he pounced on Aaron Ramsey’s pass, opened up his body and ripped the ball into the net was Lacazette at his best.“He is hungry for goals. He sat on the bench stewing on Thursday night while his team-mates filled their boots against Vorskla in the Europa League.“Lacazette desperately wanted a piece of the action and it made him even more determined to prove a point against Everton.“Arsenal look far more dangerous with the Frenchman through the middle and Aubameyang coming in from the left to join him.“It effectively means defenders have two centre forwards to deal with. It is difficult for them to know who to pick up.“Momentum is everything with this Arsenal team. Once they are ahead, they are brimming with confidence and do not look like surrendering their lead.“Before Lacazette’s goal, Everton had chances but only Richarlison looked likely to score. They still lack a player who can regularly put the ball in the back of the net.“There is still plenty of room for improvement in Unai Emery’s Arsenal side but with Aubameyang and Lacazette, they have a killer instinct.”Arsenal will be back on the goal trail on Wednesday when they take in a Carabao Cup third round derby date with London rivals Brentford.