Drives the team forward and passes at the right time to the right player.
This season could be Ramsey's last with the club, after talks over a new deal broke down.
He bobbed up again after Hector Bellerin's speculative back heel volley to twice head the ball through and was on hand to turn in the final cross from Pierre-Emerick Aubameyang.
But in the second half it was rampant from Arsenal as Lacazette got his second, substitute Aaron Ramsey scored 38 seconds after coming on and Aubameyang rounded off the afternoon with two goals of his from the bench.
"It was an important goal for Aaron and an important goal for us", said manager Unai Emery with more than a touch of understatement. "We have worked and knew we could go forward so everything is better now".
Both stars became the first two substitutes in the Premier League to score and assist a goal in a single game.
Ramsey, 27, looks set to leave next summer after a four-year deal was withdrawn by the Premier League club. The England global made the switch from the Emirates Stadium to Anfield past year in what turned out to be an excellent move for the player, and former team-mate Aaron Ramsey could be set to tread the same path. "And whether you are expected to win or not, you still have to do so".
"I believe in us, we believe in our process but also we must keep taking confidence". We will enjoy it, we are working well and we want to continue like this.
In fact, only defending Premier League champions Manchester City have scored more goals than Arsenal's tally of 19 in the top flight this term.
Arsenal are in fourth spot heading into the worldwide break, with growing hopes among fans that they can return to the Champions League next season after missing out for two years.