I believe you can maintain most of what you gain in a cycle as long as nutrition is well kept, which we know 405 doesnt have a problem with. At the end whether you gain the weight by cycling or dieting you have to eat at maintenance to maintain body weight and workout to retain muscle mass and definition, we all know this. So i think as long as you eat at maintenance after the cycle you should not lose it except those lbs that are normally water retention and stuff like that which everyone loses regardless but the true lean mass you dont lose it as long as proper nutrition is involved.
I cannot speak from experience on this except for the theoretical part and people i know which have done this.