Maybe you don't remember the 2009 Giro, but I reckon a Menchov in that form could have done a decent job of the chases Evans did. He was ironman in that race.Praetor said:Menchov could have never pulled of those 2 impressive chases Evans did in the Alps
Not to mention that he would have probably been 5 minutes behind all the others in the GC before they had seen the first mountain, seeing that Menchov is very good at losing unnecessary time by not paying attention in the first week and this Tour gave him a lot of opportunities to do so.
On your second point about Menchov losing unnecessary time, that is where Evans holds a huge advantage over him. Menchov could easily have been 5 minutes down alright.