Every team has their reasons for not winning things - like my team... 'we have a young team'.
You call them reasons, I call them excuses. What happens in the boardroom does not affect the team to THAT extent. Chelsea went from winning practically every game to scraping something like 1 point in matches. If this was a known cause of deteriorating teams' performances, do you think Chelsea would have done it mid-season?
Similar to when Ferguson announced his retirement in 2001 or thereabouts, and we did badly in the League, every body said it was a result of Fergie's decision, but that's nonsense. We didn't win because we weren't good enough. End of story.