One man, in particular, who carried on where he left off was Raheem Sterling, the scorer of the game's opening goal.
The new manager, the Telegraph said, confirmed that Laurent Koscielny, now out injured, would be his main captain, but that he would be backed up by Petr Cech, Aaron Ramsey, Mesut Ozil and Granit Xhaka.
Cech came to the home side's rescue on 63 minutes when it looked for all the world that Sergio Aguero would double City's lead at the Emirates Stadium.
City's strength in depth was illustrated when Mahrez made way for Kevin de Bruyne just before the hour mark. The 2-0 loss actually flattered Chelsea; it could have been by a margin of at least five goals. Maybe that was apprehension at the beginning of the new season, maybe we were erring on the side of safety.
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Discussing his arrivals, the manager said: "The club was willing and we took a great goalkeeper, very young but he can become a great goalkeeper".
There is no rest for the tired in England's Premier League as the 2018-19 season is underway.
Crucial to this game's outcome is how Emery approaches his first game.
There were some positive signs.
City started brightly and deservedly went ahead when Sterling brilliantly skipped past two Arsenal challenges on the edge of the box before unleashing a right-footed effort from 20 yards that flew past Cech. Even at the end, there was Arsenal intent.
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The ref needs to explain that to us because I don't understand why (it was not retaken)". We all know Thibault's quality, but Thibault's not a Chelsea player anymore.
Look at what Arsenal goalkeeper Petr Cech did in the first half, almost kicking the ball into his own net.
Arsenal rarely threatened as an attacking force until the introduction of Alexandre Lacazette for the willing but unrewarded Aaron Ramsey early in the second half. Mesut Ozil and Henrikh Mkhitaryan performed their defensive duties diligently in wide positions but their passing inside the final third was often wayward.
Problems continued after the break, when newcomer Matteo Guendouzi misjudged an aerial ball on the halfway line, which allowed Aguero a one-on-one chance.
Here are the player ratings from the 2-0 defeat.
Welbeck is among the players to have been tipped to leave Arsenal before the European transfer window closes on August 31, with David Ospina, Carl Jenkinson and Joel Campbell also expected to move on.
Paul Stewart column: Liverpool are the likeliest challengers to Manchester City
Centre-back Alfie Mawson, signed from Swansea for £15m, was another coup, while Calum Chambers joined on loan from Arsenal . The Premier League is yet to employ the VAR system which was employed during the World Cup in Russian Federation .