
First off, I looked at Man U and found that, like many predicted, Ferguson has not rotated his squad very much at all. Despite the necessary changes due to injury, a settled side of Van Der Sar, Brown, Ferdinand, Vidic, Evra, Ronaldo, Carrick, Scholes, Giggs, Rooney and Tevez have played most matches in both the league and the Champions League. Every so often he's used Nani to give Giggs a rest and he's opted to go 4-5-1 in several matches given that Rooney and Saha have both been out with injury, but, otherwise, it's a pretty settled side. The only interesting caveat is that their current list of injured players is staggering (Van Der Sar, Neville, Hargreaves, Carrick, Fletcher, Park, Silvestre, Vidic, O'Shea, Saha), which might lead some to wonder whether resting some players might have kept them fitter.
Turning to Arsenal, we see a similar pattern. Wenger has pretty much stuck with a settled side wherever fitness has allowed: Almunia, Sagna, Gallas (replaced by Senderos once injured), Toure, Clichy, Rosicky (replaced by Diaby once injured), Flamini, Fabregas, Hleb, Adebayour and RVP. This has been the case in both the Prem and the CL--a very few tactical/formation changes here and there (e.g. playing Eduardo and Walcott up top with RVP) but nothing anywhere near the scale that we see with Rafa. The big exceptions are the second CL qualifier against Sparta Prague at Emirates (dead rubber) and the Carling Cup match against Newcastle (11 kids played).
Finally, when we look at Chelsea, we see a team that has chopped and changed a bit more, sometimes approaching Rafa-esque numbers like 4 or 5 changes from game to game. They are a tough case, though, as there have been a lot of injuries to the established back four, which seems to have led Mourinho to experiment quite a bit (Alex v. Ben Haim v. Essien at CB, for instance). In addition injuries to Lampard and Drogba have led to more experimentation in central midfield and up top (in terms of personnel and formation). What can be said with certainty is that their line-ups for their CL matches do not differ appreciably from their premier league line-ups, unlike we see with Liverpool.
So, what conclusions might we draw from all of this?:
1) All of the Big Four share a penchant for rotating when it comes to the Carling Cup. (Interestingly, where Arsenal and Man U opted to play virtually 11 reserve teamers, us and Chelsea played a team that blended est. stars with reserves)
2) All of the Big Four tend to play a fairly settled side in the Prem--Yes, even us (our changes from league match to league match are comparable to those made by our rivals)!
3) The big difference seems to be when going from the league to the Champions League. Whereas the other members of the Big Four tend to select a comparable team to those selected in the Prem, Rafa prefers to ring the changes.
BUT!!!!
There is an important caveat to this: Man U and Chelsea did not have to play two qualifying matches in the Champions League. That means that they've had fewer midweek disruptions during the start of the season and that they did not have to "switch gears" between competitions until they'd played six league games.
So, let's leave them aside and compare our situation with Arsenal, who also had to qualify for the CL proper. Like us with Toulouse, Arsenal had to travel away to Prague in the opening leg of the qualifier, having played only one Premier League match as warm-up. Unlike us, however, Arsenal played the exact same line-up in Prague that they had fielded three days earlier at home to Fulham. In case you were wondering, they won 2-1 against Fulham and 2-0 against Sparta Prague. We, on the other hand, made six changes to the team that beat Villa when we took to the pitch in Toulouse (in the sweltering mid-afternoon French summer sun, it's worth adding). It may also be worth pointing out that Arsenal did not have to face Chelsea four days later, although they did have to travel to Blackburn, who are no soft touch at home. To complete the story, both ourselves and Arsenal rang the changes for the return ties of the CL qualifiers (we made 6, they made 5), correctly confident of getting a result at home.
Moving into the group stages, we have mirrored the other Big Four teams by putting out stronger teams on the road (Porto) and weaker teams at home (Marseilles). In fact, our team against Porto was arguably the strongest possible team we could play. Against Marseilles, Rafa clearly banked on the fact that we were playing a struggling French outfit at home on a European night and that even a weakened team could turn them over. If it's any consolation, Chelsea fielded a very strong team against Rosenberg at Stamford Bridge and still only managed a draw. In contrast, the Mancs played Roma at home while Arsenal hosted Sevilla, two teams that I think even Rafa would field a very strong 11 against.
Okay...went on a bit of a ramble there but the overall picture is clear: we rotate more than our top competitors when it comes to the Champions League and that's the difference at the end of the day. Whether you think that's responsible--in whole or in part--for our current dip in form I leave up to you, but that's been the situation so far this season.