Until the recent shortage, cigar seemed to me like it was the third most common cordovan color. I have and have had more cigar shoes than ravello/whiskey.
At their best, color 8 (dark burgundy / purple&red tint) is darker than cigar (milk chocolate with an olive tint), but the two can overlap from the time to time, similar to how whiskey and ravello can overlap
As far as why it isn't more common, good question, it's probably just a choice by Alden.
I wish Alden had a more attainable solution for brown shell. Their lack of this option forced me to go to AE for a brown shell shoe. I doubt Alden cares, tho.