Our player's fitness has not caused the huge collapse. Its been completely debunked by any statictics you want to use (games played or minutes play). Debating it is just a distraction form the actual issue.
http://www.guardian.co.uk/football/blog/2012/apr/28/harry-redknapp-tottenham-england-fa
"This is not the first time something like this has happened. Bordeaux had a nine-point lead at the top of Ligue 1 midway through the 2009-10 season, with 14 wins from 19 games. They had sailed through their Champions League group, beating Bayern Munich home and away. They had won the previous season without a single home defeat and were daring to wonder whether the treble was on. "We all believe we can do it," the defender Matthieu Chalm?® said in the final week of January.
Then Jean-Pierre Escalettes, the president of the French Football Federation, went public with his belief that Laurent Blanc had strong credentials to coach the national team after the World Cup. Blanc, he said, was "an exemplary man" and a "good candidate" to replace Raymond Domenech.
Bordeaux went into freefall, winning five of their next 19 league games. They finished sixth, outside the Europa League positions, with eight points from the final 10 matches. Lyon knocked them out of the Champions League and Marseille beat them in the final of the Coupe de la Ligue. "It was like a plane crash," the midfielder Fernando remembers.
A similar thing happened when Sir Alex Ferguson was supposed to be retiring from Manchester United after the 2001-02 season. The players, Ferguson says, "relaxed." They had won the league by 10 points the previous year. Now they finished third, 10 points behind Arsenal. United's nine defeats that season is their highest number of the past 20 years.
Ferguson has believed ever since that a form of complacency can set in when a manager is planning to leave. Insecurity, too. At Bordeaux, key players such as Marouane Chamakh and Yoann Gourcuff started wondering whether they should hang around if Blanc was moving on. The most cautionary part of this story for Spurs is that the 2009 French champions have never really recovered. Last season they finished seventh. The current side are eighth. Even now, they won't talk publicly about the reasons everything started to fall away. But everyone knows."
You'd be stupid not to agree with Ferguson on most things football related.