Armory they thought they were winners when they beat Paris Saint-Germain and Napoli against Nicolas Pepe this summer.
So good the Gunners thought the Ivory Coast international was that they even sacrificed interest in Wilfried Zaha, who had already been touted as his main transfer goal.
But we have eight games in Pepe's Arsenal Premier League career and so far the striker has failed to live up to expectations.
There was a strange glimpse of his talent: his quick feet against Liverpool, the impressive nutmeg against Burnley.
But the Ivorian ended up looking like a shadow of the player he was against Lille – and the statistics confirm it.
At the current pace, the Arsenal star is about to end with drastically lower numbers than he did for Lille in Ligue 1 last season.
He played 3540 minutes for Lille last season, scoring 22 goals and registering 11 assists in France.
But at this rate, he's about to end with just six goals and six assists for the Gunners.
Perhaps one reason for this is the lack of touches in the opposition area.
At the current pace, he is about to finish with around 102 and in the last period he managed 119 in the French first division.
Of their total shares this season, 55.8% were successful – down 1% from last year.
Wyscout's unique algorithm gives the player a chance to score.
And while he had an XG percentage of 19.08% for Lille last season, he's only 2.2% in the current campaign – meaning he's on the verge of games rather than being a prominent figure.
Pepe is also clearly finding the Premier League difficult to adjust.
Last season at Lille, he managed 288 dribbles in 38 Ligue 1 games at a 47.6% success rate.
But that number has dropped to 40.7% in the Premier League this year, suggesting that rival sides find it easier to arrest.
Of his offensive duels, Pepe won 29.9% of them.
And that number also dropped, with the Arsenal star managing a 38.7% success rate for Lille in Ligue 1 12 months ago.
Your heat map this season, compared to 12 months ago, is another concern.
Data shows how he would catch the ball from the bottom of last season before using his fast pace to explode into action.
But Pepe is starting to move forward at Arsenal, perhaps meaning his speed is not being used by manager Unai Emery.
It is still too early to really judge the Gunners ahead. But statistical data suggest he needs to improve his game to justify the club's decision to shell out £ 72 million.