In my experience it's not the jars that really "bring out" the aroma per se, but they do lock in aroma that is already releasing activated. The longer you stretch out the dry, the more the aroma "activates" so to speak. Think of it like marinating meat. Since the humidity is too low where I dry, I like to only line dry for 48 hours and then let them go a week inside of paper bags. The whole point is to lock in enough moisture to drag out the dry time as long as possible without holding in so much moisture that the buds never dry. If your buds dry too fast, they will smell like hay forever. Always better to put buds into bags/jars a bit early instead of waiting too long imo. Just make sure when you jar them, you dump them out and let them recrisp every so often before putting them back into jars/bags. The longer you stretch out the dry, the tastier the flavor. The longer the cure, the smoother the smoke. Over in Spain, they like to pump dry rooms with humid air to make their dry cycles take up to a month before even starting cure.
Some say Arjan has the original, and some say Shantibaba took the original WW genetics with him when he left off to Mr. Nice Seeds. Some say if you want the real Cannabis Cup winning WW you need to buy "Black Widow" from Mr. Nice. Some also say that the Cannabis Cup is one big sham publicity stunt though also so I dunno