It's possible that Bournemouth will win Chelsea because of their consistency in their previous matches. Chelsea's performance is not stable and unpredictable which makes it impossible for you to rely on them. Bournemouth is in their best form and shouldn't be underestimated because they don't have a big name. Chelsea needs to improve their performance if they don't want to be bonus point for Bournemouth.
That's right, Chelsea played very badly in the last few matches which caused the points to be left behind, their defense is very fragile, the opponent is quite easy to break through the defense to produce goals, they must get up immediately if they don't want things to get worse
It'sup call for Chelsea about how shit their defense, and they can sign a new CB or at least try to recall Chalobach from Palace. I'd call Maresca dumb if he is not signing a new CB during the winter. They have a lot of resources to make it happen.
It's easy for Chelsea even to bring quality CB to the club. They have to find good CB asap. They may not qualify for UCL if keep play with their current CB.