The answer is: none of the above.
verybody was doing "Davy Crockett" comics. There was the aforementioned Kirby series over at Western Tales; Charlton had its own Davy Crockett comic between 1955 and 1957 and also featured the character in a series named Wild Frontier; Avon released a Fighting Davy Crockett one-shot in 1955; the character appeared in DC's Frontier Fighters comic; and Dell published several Davy Crockett comics based on Disney's TV version.
On June 20, 1955, writer France "Ed" Herron and artist Jim McArdle began a new "Davy Crockett" newspaper strip (the ad at left and the first strip below are reproduced from the Spokane Daily Chronicle, courtesy of Google's newspaper archives). Herron had worked on and off with Kirby since the early 1940's, and is credited with co-creating the Red Skull, among other characters.
|The first Davy Crockett daily strip, from June 20, 1955.|
Back to the Kirby-drawn "Davy Crockett" pages from Marvelman #231. Dave Gibbons posted a comment on this blog noting that the pages looked like re-formatted newspaper strips. All the pages posted by Matt Gore have a white space at the top left corner every three panels, which is where the title of the strip would have appeared in a newspaper. So there was an extra clue.
Then, in a discussion over at the Grand Comics Database's mailing list about the provenance of these Kirby pages, someone pointed out an article from early this year which contained the solution to the mystery. On March 2012, Jean Depelley wrote an article at BDZoom.com that explained where these Kirby pages came from.
It turns out these Kirby pages were also published in France (a decade after their U.K. appearance) in Zoom #15 (October 1968).
|From Zoom #15. Check BDzoom.com for more scans from this story.|
|From Marvelman #231. Note what a difference Artie Simek's lettering makes compared to the French version.|
In his article, Jean Depelley describes the discovery of this story by French fans, their failed attempts to trace it to an American comic-book publication (they also considered the stories in Western Tales as a possibility) and their arrival to a conclusion: that these are newspaper strips Jack Kirby ghosted for Ed Herron's Davy Crockett strip during a transitional period in early 1957 (which would apparently date them before the Atlas Implosion).
The evidence is in the BDzoom.com article: the "Columbia Features Syndicate" copyright notice, the "Herron/McArdle" signature in a later strip, and the fact that the continuity of the Kirby strips flows naturally from previous episodes drawn by another artist (showing that Kirby's pages weren't a stand-alone work, he was following somebody else's story). So that's a minor mystery solved. There are probably other fans who were aware of the fact that Kirby ghosted these "Davy Crockett" strips (it's unlikely that nobody else has noticed this fact in the 55 years since the strips' original appearance), but Depelley's article is the only place I've seen this documented.
One final digression: I remembered Depelley's name from his appearances in the Jack Kirby Collector, usually in the letter columns but also as an occasional article writer. And as revealed by Tom Scioli in his Angouleme diary early this year, Depelley is also working on a Jack Kirby biography focusing on his war years. As Scioli describes it: "He’s put together a timeline of when and where Kirby was during the war, based on Jean’s interviews with the children of the soldiers Jack was stationed with. He’s visited the sites of various battles that Kirby had been involved in."
Sounds like this could be a really good book. Depelley has written a series of "Adventures of Private Kirby" posts over at BDzoom.com which show some of his research. I haven't read them all yet, but look forward to doing so soon.