Chelsea can perform better this season than the previous season, now they are in the top 4 of the standings which was very difficult for them to get in previous seasons. However, their opponents are also quite good this week, so this also cannot be an easy match for Chelsea, although I agree that their chances of winning the match are greater than their opponents. Bournemouth, cannot be underestimated at all, they can also show when facing a team that on paper is better than them, they can provide quite good resistance, so Chelsea must be careful.
Well they still have many games ahead to play and until they have less than ten games remaining then I can say they are a good team and probably have the contending potential for the trophy but for now I cannot give them that credits because they are still looking inconsistent, literally in the last five games, they have struggled to get a win, as they lost one and drew the other four so a possible chance of decline may be something they may face soonest so I rather give room for that time for them to prove themselves before I will be able to assume their chances around the possibility of them winning the title or maintaining a position at top four and probably been able to secure a spot at the UCL next season after a very long time.
They didn't actually draw the other four games, they lost two games and drew the other two games, while winning one just as you have said.
Chelsea is still not stable, this is the only thing I can say, and it is very expected, they did not begin this season with the very quality they are playing on right now, they found this quality along in the middle of the game and as such, inconsistencies are expected, personally, I have no hope of any kind when it comes to Chelsea winning this season's title, they have lost that opportunity as far as I can tell, right now, they can only work hard to remain in the top four, and also to improve more in preparation for the coming season.