That endnote #6 is quite interesting:
6. The connection to Mobile Bay as the site of the landing was made when an early Spanish map of the Gulf Of Mexico, dated 1519, labelled Mobile Bay as Tierra de los Gales—Land of the Welsh. See Williams, Madoc, p. 44. Some speculation on this curious fact has to be connected to the marriage of Henry VIII and Catherine of Aragon and the subsequent birth of the princess Mary in 1516. Henry's own Welsh roots coupled with a Spanish marriage surely must have been the reason a Spanish map would make reference to the Welsh. Not to belittle the power of this myth--to this day there is a plaque at Fort Morgan on the East Coast of Mobile Bay commemorating the Welsh landing by Madoc in 1171!
Quite frankly the logic of Henry VIII having Welsh roots being the reason for a Spanish mapmaker to label Mobile Bay as 'Land of the Welsh' escapes me! Why not label it as 'Land of the English'? After all he was King of England!
