Since losing 2-0 against Manchester City on the opening weekend, Arsenal have remained unbeaten in 13 Premier League home games (W11 D2), winning the last seven in a row.
"Everyone played like we want, and after the match on Thursday, playing today and Wednesday we needed different players because playing this intensity is not easy, and the performance like we want we need everybody", Emery said, quoted by Sky Sports.
Arsenal now sit in fourth place, their old stomping grounds, but will expect a win against a middling Bournemouth side at home. In the first half we played very well but we wanted to carry on in the second, but it's not easy 90 minutes with this intensity.
Lacazette should have put the game out of Southampton's sight when Sead Kolasinac unselfishly played the ball through for him in a good scoring position, but he blazed over from a similar distance to his opener and let Saints off the hook.
With all those changes in personnel, and formation, perhaps it was unsurprising that it was Southampton who started the brighter. The midfielder struck a low shot that was turned in from close range by Lacazette, leading to another pause - this time by the Southampton players who were looking for an offside flag that rightfully never came.
The Gunners doubled their lead in the 17th minute when Mkhitaryan added the finishing touches to another Iwobi cross. And Unai Emery is now one of the more happier managers in the Premier League. Here are the player ratings from the 5-1 win.
"We just have to keep working and trying to our best to win three points in every game".