At least, because previously Arsenal managed to beat Manchester City, of course, this factor will make it predicted that Arsenal will also win against Chelsea. After all, we are all aware that Chelsea's situation and conditions have been devastated since last season, and have not improved until now. Therefore, it is natural that Arsenal remains the team that is projected to win this match and as such, the home and away factor is no longer important at this moment because on paper Arsenal will definitely win.
Mikel Arteta surprised everyone after a thrilling victory against a competitive side like City. Pep Guardiola couldn't believe his side was defeated by Gunners, well its football and alot of things happen. Arsenal didn't managed to win Manchester City, they humbled the citizens at Emirates stadium with full potentials. The Gunners are fiercely competitive this season, they missed out at slightly vision on EPL, more reason they're upset and keen on standing #1 on the table. They face Chelsea next, it would one of the tough game for them but they have higher chances of winning because the blues I'm aware of are merely starting to win games.