Hmm. I don't disagree, but -- it's "standard" only if you've been paying close attention.

Because the original "standard" version ("encroaching communists") which I first read in Bobby Kennedy's everywhere-available book Thirteen Days was accepted for decades -- up through the 1980s IIRC.

This article (http://www.theatlantic.com/magazine/archive/2013/01/the-real...) pegs the date where the old standard story was rendered untenable, and replaced by the new standard story that you mention, as 1997 -- when tapes from the JFK administration became available. The relevant book (https://www.amazon.com/Averting-Final-Failure-Meetings-Stanf...) was copyright 2003, 50 years after the crisis itself.

It's always hard to remember at what point the old story became the new story. Some caches don't even update at all.

(2013). This article is a review/excerpt of http://www.amazon.com/Cuban-Missile-Crisis-American-Memory/d... by Sheldon Stern, a former historian at the JFK library in Boston.

Two earlier books by the author:

http://www.amazon.com/Week-World-Stood-Still-Stanford/dp/080...

http://www.amazon.com/Averting-Final-Failure-Meetings-Stanfo...

Some of the source material is available here:

http://millercenter.org/presidentialrecordings/kennedy