Your argument doesn't really make sense either. A cruise is to give the body a break from blast-sized doses WHILE maintaining current progress whether it's strength or mass.
I do agree that that month or two before and during PCT is where your lowest test levels are but according to your earlier posts you implied that genetics/hormones aren't involved in maintaining mass and that one can shift their homeostasis significantly enough to change what your body chemistry allows you to maintain by holding onto the mass.
I'm not saying you will go back to 180lbs if you come off the gear. It's impossible to say what weight one can maintain naturally bc it depends on hormones/genes, diet and training, consistency, body composition at a given weight, etc. What I am saying is that AAS use can SLIGHTLY increase your homeostasis point but only by a few pounds. If your body can theoretically maintain 200lbs at 8% than if you come off gear completely at 240lbs at 8% you will drop back down to your natural genetic potential in time. The length of time you maintain the 240lbs on gear does not mean you can maintain it off gear.
Also let's be realistic here. When you end a cycle you have supraphysiological test levels. If running test e or c you'll still have normal levels after around a week of ending the cycle. By the second week (14-18 days) is when exogenous test levels are low enough to warrant beginning pct. So this is only really 1wk of LOW/catabolic as you called it levels. While you're running your PCT, the Nolva/clomid combo is artificially raising your testosterone levels bc that's what they do by stimulating LH release. So for your entire PCT you are around normal testosterone levels anyway. After coming off PCT your levels will drop again until the PCT compounds finish metabolizing. Natural test production can come back at that point or take a while longer. But up until this point you've had maybe a week of 'catabolism'. How much muscle do you expect to lose in this amount of time? It's only really a worry if it takes you an unusually long period of time to recover but this isn't the case for everybody.