After further checking these 2 fellas appear not to be the same person, but if they are, is it possible to explain the name change.
Edwin W HAYDEN b 6-1897...his initial is W on 2 census, and you state mom's maiden name is QUINBY.He appears to be a teacher 1920 WY, but find nothing further.
Edward Downing MACKAY b 6-10-1895 Saratoga WY; divorced from Goldene by 1940, altho he is mentioned as her hubby in her obit. 1942 Draft Reg, Portland OR;engineer for power company; his NOK was Marie MACKAY...same address as his;
1930 Portland, Multnomah OR MACKAY E Downing 35 WY - CO Goldene 33 MN Edward 4 WA Thos & Mahala VICKERMAN lvg with them.