Lacazette has spearheaded Arsenals attack for most of the season with Aubameyang being pushed into a left-wing position when he starts.
Arsenal fans are desperate to see the pair play regularly together as the Gunners bid for a top four spot.
Emery, though, says he will continue to rotate the pair and says every match is different.
We are in a process. It will work for one game, but then not for another, said Emery.
You have to look for answers to all different matches. I love analysing them.
When I left Valencia, I told the president that I was more analytical of coaches than of players. I dont have time to analyse players. I am more tactical. Wenger, for example, was more about pure football, more of a player coach.
More: Arsenal FC
Arsenal face a tricky trip to face Bournemouth on Sunday in their first match after the international break.
The Cherries have lost their last two matches after a fantastic start to the season but can go to within one point of the Gunners with a win on Sunday.