As you can see, the probability of Chelsea winning is estimated at almost 50%, which should be very strange for teams with such different value of squad and expenses. By the way, +93% in a home game looks very tempting, but when Chelsea is in business, you don’t want to take risks even for such a profit 
Because they think when the match is happen in own home, there's a good chance the home's team will win, but Nottingham were able to beat Chelsea in Stamford Bridge is really mind blowing lol. Although Aston Villa were not good like the last season, but they're better than Notthingham Forrest.I believe Aston Villa will able to beat Chelsea.
After all, last season Aston Villa also managed to beat Chelsea at Stamford Bridge and yes, because at this moment Chelsea's performance was still very disappointing. So maybe, I'm still not sure about betting on Chelsea in this match, because maybe the match will end in a draw and maybe Aston Villa will beat Chelsea again at Stamford Bridge. At least anything can happen and of course, because Aston Villa is in a better position than Chelsea in the Premier League standings. So yes, this factor could be a trigger for Aston Villa to be able to hold off Chelsea or maybe beat them.