Spurs, for example, haven't just gone off form - they've almost collapsed, earning a full point per game less. As it stands, that is one of the worst drop-offs in league history. Liverpool, meanwhile, aren't far behind.
-----------------
Which brings us to Spurs. Naturally, a decline that extreme has more than one major cause. Indeed, it's a culmination of all the above.
For one, Harry Redknapp has ludicrously overplayed his first XI as he sought to wring the most out of a front line that was then, admittedly, exceptional. Spurs have seven players with 29 appearances or more - the most among the top teams.
So, not only is their intensity inevitably lessened but Redknapp clearly doesn't trust any alterations. The majority of his changes have either been cosmetic or self-defeating, like the recent shuffling of Luka Modric and Gareth Bale.
On top of all that, there has been the confusion surrounding Redknapp's court case and his next job. Suddenly, that looks slightly less certain - but that's only in-keeping with many early-season 'truths'. The key, now, is whether they can force more changes in the finish.