Your overall point may be good, but I feel the need to point out that Crockett died in 1836 and the Whig Party was pretty much dead by 1860 when Lincoln was elected as a Republican president.
Bottomline: It may be a myth, but myths tells us things that resonate through the ages. On a certain level, the story is true, even if it never happened.
Would that make this story....”Fake, but accurate”....?