"Petr Cech was the best player on the pitch, clearly".
Emery's side extended their winning run to four matches in all competitions with a 4-2 victory over Vorskla Poltava in the Europa League on Thursday.
Some pundits had questioned whether Cech could adapt to Emery's style of playing out from the back, but the Arsenal coach has no doubts.
Of his successors, Gilberto Silva was a fine player and Mathieu Flamini showed promise, but the role has largely been neglected or mis-cast - with Xhaka, who looks as though he would much rather be attacking, a case in point. "It is clear that we have a very, very competitive team to do that - I am confident in my team".
"Leno is calm and knows now that he's working well, but also we have three goalkeepers and Petr Cech is delivering good performances".
The pace of Walcott and Richarlison threatened Arsenal's defence throughout the first half and the pair combined for the latter to again test Cech.
The German experienced a tricky start to life at Arsenal as he waited for a chance to replace Cech, who has struggled to adapt to Emery's desire for a goalkeeper who can pass out from the back.
Shortly after, Pierre-Emerick Aubameyang poked in from close range after Mesut Ozil broke down the right, cut the ball back and Ramsey nudged it into the path of the Gabon global.
"It is not important, maybe yes!", Emery said with a grin when asked if he was set to substitute Lacazette.
After 108 goals in 397 games for Arsenal, Walcott moved on to Everton, and has so far notched five goals in 20 games for Everton, with the winger no doubt hoping to add to his tally today. "Assistant referees can make them".
Aubameyang is having to play on the left wing to accommodate Lacazette as the team's central striker, but it is not stopping the Gabon striker from scoring.
The Gunners are back in UEFA's secondary competition following a disappointing campaign that saw them finish sixth in the Premier League.
The former BVB marksman registered 10 goals across 14 appearances, all of which came in the league, for the Gunners last season making him the fastest player to reach 10 Premier League goals for Arsenal.