These are some reasons why he might:

– his relationship with Abramovich was healed fairly swiftly;

– he loves English football culture (and that culture loves him, mostly);

– his family would be happier in London;

– the fans at Chelsea will adore him; that will not be the case at another English club;

– most of all, he has unfinished business at the club.

– it is financially more secure than a club with large debts, which are very vulnerable to interest rate rises;

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The only question is whether Abramovich is willing to cede control over all football affairs in the club to Mourinho. He might – I think it’s in both their interests…