Because Chelsea's advantage only lies in playing at home, this will still make it difficult for Chelsea to win because their opponents are much better than them in strength. Arsenal is very determined to win the match at Chelsea's home because Arsenal is very close to the top of the standings so Arsenal's enthusiasm will probably be very passionate at Chelsea's home because Arsenal really wants to win with a lot of scores in this match.
I personally don’t think playing at home is that much of an advantage. It alone certainly won’t help win the game for the club. Playing at home may have some certain perks but when going up against a much tougher opponent, those perks may not make any impact.
In this case, Arsenal is in a much better form than Chelsea and despite Chelsea playing at home, I don’t really see how that could give them an edge over their opponents who presently, are seemingly better.
The possibility, no matter how slim it may seem, of Chelsea having a win also cannot be ruled out but I just don’t think they’ve presently got what it takes to win Arsenal.