At my interview at ESPN, a variety of people told me about what became ESPN's Soccer Power Index (SPI) and how it was a formula created by Matthew Silver to provide a more accurate World Ranking than what FIFA currently output(s). Both are power rankings so its really apples to apples.
Anyhow, they told me how he was going to factor in injuries and whether or not a nation trotted out their "A" Team or their "B" Team...sat/rested starters, etc.
I think its a novel concept, I'm all for improving something that you think you can do better, however I think this is overkill. I didn't tell them this obviously (or not so obviously, the only thing I asked was if they were going to use it for club soccer as well and they werent....shucks), but I think any time IN REAL LIFE, where you start trying to differentiate between coaches' intent and other things like that, I think you're dabbling in things that are way too subjective and are up for much debate. I mean, what if England's Team B matches up better to Egypt's Team A than their own Team A, and that's why the coach played that lineup.....the system doesn't/can't possibly account for that. The sad part is, let's say Egypt wins shockingly 4-0 but they don't get the full credit for beating England per se because they didn't play their "A" Team in the context of that term, even though England's coach put out what he presumed to be his best lineup v. Egypt's #1s.
I just don't dabble in that...there are a lot of freak things that happen in sports, injuries, suspensions, lineup adjustments, fan altercations that affect the game, but you can't logically micro-manage every last situation and presume WHAT IF England played their As, etc....thus my answer is, reward the winners and penalize the losers as if they played each other at full strength/peak efficiency. You may look at this and think I'm crazy, but it isn't the opponents fault if USC came out, played flat and lost because their hearts weren't in it, that shouldn't take away from a team's victory. If you play the Colts and Peyton Manning happens to get hurt for the first time in his career, then thems the breaks, you got lucky in the fact that Manning got injured, but you still get FULL credit for beating that 14-1 team. I honestly wouldn't do rankings any other way, and I largely don't like ESPN's SPI because its too complex for its own good...it overweighs things that I chalk up as everyday sports happenings.
I hope this piece shed some light on the situation...gave you a bit more insight as to where I'm coming from...whether you agree with me and my premises or not.