losing a percentage of gains is not merely the body not adjusting to its new size, its a combination of factors. natural testosterone suppression can lead to some loss in gains because after the cycle is over, the enormous excess of test that was present in the body is gone, and the body cannot provide the newly enlarged muscles with enough hormone to keep them happy. also, when using roids that produce large amounts of water retention, it is posssible that a great percentage of lost weight is only the excess water from the cycle.