Wow..I can't believe these myths still exist...
Potency of cannabis is determined by the time it is harvested..the numbers won't go up afterwards..and forcing it to go moldy will only bring it down a few points as well as expose the smoker to the risk of serious lung infections..
And making iso-oil is just that..you are in fact not increasing the potency of your pot..just removing the stuff that gets you high and making it more available without having to smoke all the vegetative matter that goes along with it..