You would think so, but it is not a good mass builder IMO. I ran a 4 weeker alone, and didn't get much at all in the way of weight gains. It did add a really "defined" look, and I did get stronger.  You make a good argument, but I just don't think it is a good mass sustainer. You would also think that because you get stronger your muscles would grow to some extent.  I am sure this is true somewhat , but I think because it is so androgenic w/minimal anabolic properties this just doesn't seem to be the case.  Because it has a 9 alpha-fluoro it can't metabolize to estrogen.    I think it would be useful during a cutting phase to provide a more harder, dense look. Or during a bulking phase in conjunction w/ a good mass builder.  I will say it shuts you down too!