I agree with those who question the "Size matters" hypothesis...
I look at a child who has almost no muscle mass at all yet has incredible strength... Or, isn't an ant supposed to be able to carry 50 times his own weight? Yet where is HIS muscle mass?
Conversely, when my mom had a stroke, her left side ended up having little or no strength -- even though immediately after the stroke, her muscles had not changed...
And, then you get to my experience with CoQ10 adding 10-20% to my strength -- because suddenly my body was able to make ATP again...
In short, I there there is far more to strength than the size of the muscles...