Scott, my 40 years of experience leads me to a far different conclusion. Long periods of fatigue are not periods of positive adaptation, excessive fatigue for more than a week or two is detrimental. ME periods are the same, if you are not getting fitter every few weeks you are for sure over-training. Over training defined as the absence of improvement over a couple of weeks. What data do you have to support that someone can be in a state off fatigue for 6-8 weeks and positively adapt at a higher level. Sorry don’t buy it. Coaches who deny overtraining have not had enough experience to know what over training really is.