It depends how hard you train. You don't want to go overboard and risk an injury that will sideline you and put off gains.
The results you get will be everything that you put into the equation, and the equation is the multiple facets in PE, such as focus, training intensity, duration, exercises, etc. the list goes on.
If you train your ligs just hard enough not to cause an injury, then you might want to take a day or two off from that particular exercise like Red suggested in that thread you are talking about and perhaps the next day do something else that targets other growth like kegels for example. Now if you trained the ligs at a moderate or lower intensity there will be less of that "good damage" so it would still be strong enough for a follow up the next day if you wanted to build upon that "good damage". At some point I think the body will adapt to the moderate damage and learn to heal that type of intensity a lot quicker, but it could be argued this is a "safer" route.
I know this from fitness training where in the beginning of a personal routine it would take days for my body to heal the hypertrophy and soreness. Now if I did that same routine it would heal in hours. This is why I progressed to more sets or reps, or addition of exercises or a change somewhere, maybe super-sets etc. These changes and/or increases in intensity brought about hypertrophy again which would last for days again and spurred more growth.
So these are the variations you will have to consider and experiment with. Gains can be obtained from both. Which one is more effective at growth rate is another great question. But there are still other variables which affect growth rate as well. For example a guy can do a few simple exercises consistently and gain an inch in length in a year which is outstanding. But maybe he could have gained even more if he had included more
ADS or another addition or tweak? Another guy may have done the same thing but gained less. Maybe his technique and intensity was off? Etc.
So basically it's an equation and as soon as you start working on it and figuring the elements out you will start gaining in one way or another.