I went throgh th archives to find Roger's and/or Roger's explanation of how they agreed on the date of Allison showing up in Dodge City as September 24, 1878 and not the 19th, as Roger Myers first thought. I found a post of mine in which I added a link to a post of Roger Jay's in which he explained how he and Myers arrived at that conclusion. Unfortunately, that link was to Texas Jack's old page and does not bring up anything. I did find this message from Roger Jay, though, in which he confirms that he and Myers arrived at September 24th.
https://nediscapp.herokuapp.com/discussion.cgi?disc=39627&article=23299&page=0