That make perfect sense.
So why did Topps make black backs for Heritage 2014?
I have no idea. Seems like another contrived gimmick to me.
The 2014 black backs were unnumbered short prints. And by short print I mean short print. Casebreaker Brent Williams gives an estimate of about 10 copies of each card(according to this thread). It seems like they were falling about one or less per case.
With such scarcity, I didn't hear much buzz about them. In fact, I didn't even bother looking for a Darwin Barney version of the card....until I saw one on Ebay a couple weeks ago.
I could corner the market on the 2013 cards because they were going for practically nothing; three or four bucks each. The price on the 2014 wasn't that cheap; not even close. But for a card that could be /10, I got it for a decent price.
I believe I've got all the backs...
...the regular, black, and blank.
And since the blank is 1/1, I would be the only collector with all three.
My first and only complete and exclusive Barney Back rainbow.