Cello turns yellow over time in a humidor because the gas/air exchanged from the cigar to the humidor contains little droplets of oil from the cigar. In that respect, cigars are swapping bits of themselves in your humidor.
I haven't noticed any kind of "generalizing" of flavors of my sticks, they all remain unique in their own respect. However, the oldest I have are around - 4 years old or so.
The only way to really tell would be to keep a control humidor and then put sticks in another, mixed with others. Then after a set time, see how they compare. That would be kind of a fun experiment actually![]()