From JR's site ...
Q: Will my cigars "marry" if they are sitting side by side in my humidor without dividers or cellophane?
A: No. I understand the concept of marrying, and have witnessed claro cigars that have been slightly stained with oils from a dark, rich EMS cigar that was sitting beside it, but that was only after MANY years. Honestly, I do not consider the marrying of different cigars to be a problem for those who smoke from their humidors on a semi-regular basis.
I have been storing singles side by side for well over a decade with no impact whatsoever. Personally, I find the concept of marrying flavors between differing cigars to be an issue that "cigar wonks" banter about, but has little basis in reality and does not warrant any concern on your part. You have to keep in mind, when you read all the recent advice printed about cigars, that quite a bit of it is far too reaching and overtly scientific without cause.
I have kept a wide variety of smokes crammed together for long periods (5+ years) in my "smoke from someday" humidors without this ever occurring. My only concern would be to always keep flavored (i.e.. rum soaked, Acid, etc.) separate. Also, for long-term aging in quantity, I believe in leaving the cigars in their original boxes if possible.
Bottom line: the concept of cigar flavors marrying/blending is over hyped.