Actually that reminds me of the whole point I was making about beginner programs...and how everytime you hit the damn gym you are going to be stronger...
You know there is something called the general adaptation thingy which basically says that at first you adapt to everything in very similar ways because there are common changes you body can make to improve and it doesn't have to be very "specific" yet.
The fact that you are able to put 5 pounds on your squat everytime you go in...has nothing much to do with whether you are doing 4x6, or 5x5, or 3x5...only the time course changes.
But why do the pyramids still stand after thousands of years and the 400,000 dollar townhouse you just bought start crumbling after 5 years?