No.
Mate, it takes a shit-load of testosterone to build muscle rapidly like steroids do, but just simply holding onto existing muscles is another.
The reason you lose gains from a cycle IS NOT because natty test levels arent enough to sustain said muscle mass, (unless over your natty limit).
Its because of the time inbetween cycle T levels and natty T levels when you come off. You have to go from 9000+ng/dl to 0ng/dl then back to 885ng/dl (This is my natty T level).
Think of it as a car going at 200mph, then has to brake to 0mph then cruise to 55mph as soon as possible.
You take Nolvadex, HCG, Clomid ect to decrease the time in which your natty T levels take to get back online.
In our analogy, it would be like adding stronger brakes and a powerful engine to the car to help it get to 0 and then cruise speed faster.
Thourough PCT > Less time taken for Natty T levels to return > Less time spent in extreme catabolism > Less muscular atrophy > More gains retained.
This is the entire point of PCT.
If you could turn your natty Test Levels on-off like a switch, you would lose no gear when you came off cycle (If your below or at natty limit).
So, in final;
LOSING GEAR HAS NOTHING TO DO WITH LOW-NATTY T LEVELS, BUT RATHER THE TIME IT TAKES TO GET BACK TO THAT NATTY T LEVEL.
@AntiSocial-Fakecel