Having said decisions don't impact on each other, I certainly see a lot in Lotak's argument, but I think my original statement still holds. Having said that, as Dona says a bad decision can also have knock on effects so that we don't know how the rest of the match/season would have played out without them. For example I'm thinking that Balotelli's unpunished (at the time) assault on Parker was more than just important for the match, you might argue our season started to fall away from there, even though we've had some good results since. I'm also thinking that, for another example, a bad challenge that goes unpunished sets the tone for the match (perhaps as happened in our Sunderland away match). If a yellow card had gone in early, perhaps the whole match would have changed... and that I think is where ManU may get an advantage in that (IMHO) refs would be more prepared to penalise the opposition earlier, particularly at OT.