If you age a group of different cigars together in a humidor for any lenght of time they will all begin to marry plus take on the subtle taste of the cedar inside the humidor. With prolonged aging you could end up with cigars that taste like every other cigar in the humidor with only minor flavor nuances due to the actual type of tobacco in the stick itself. By putting them in the tubes and sealing it, after it has rested in the humidor for a week or so to stablized, you prevent this from happening. Then the leaves in the stick marry only what it is rolled with. No crossing of cigar flavors. Sometimes this mellows the smoke, sometimes not.
I do age some of the harsher or too green cigars in their cello but that is because I want them to aquire the cedar nuance to perk them up, or I want them to lose some ammonia to take out some of the harshness.

Gene