Just because it is a home match for Chelsea doesn't mean it is a winning match for Chelsea. Of late Chelsea haven't been winning their home match. Only this beginning of the season alone, Chelsea lost their home match to Nottm Forrest and Aston Villa.
Of course mate, that's a good point you made, because I see nothing special or advantage about Chelsea playing from home but however if they should say Chelsea will have a home advantage how about those other matches they lost at there home.
The truth is that weather playing from home or not what matters is performance so there is no home advantage if they are very low in performance, and secondly is very obvious that Chelsea is no longer the way they use to be, because you can hardly predict there matches because when you feel they are beginning to peak form the next thing they became worster.
Perhaps I don't think they stand any chance against the Arsenal team.