>>recovery is not possible while exogenous hormones are still suppressing your system
I agree with that, and I think anthony roberts does too. Consider this. In this cycle, blood engrogen levels got to roughly 8x normal testosterone levels. One week after the last shot of test, they are still 3x. Two weeks after they are nearly 2x. Clearly one shouldn't wait TOO long, one needs to start PCT so most of it is overlapping the crash zone.
However, and this is the important part, some cycles can leave androgen levels elevated for 4-6 weeks after the last shot, and one might start AND FINISH their PCT before androgen levels get down to baseline, resulting in continued suppression after PCT has been completed! Clearly that is counterproductive. That happened to me, and I needed a second PCT. In my case, waiting clearly would have helped.
I suggest being especially cautious about this with high dose deca cycles (> 400mg/week). They are suppressive for a very long time after the last shot.