I would never have guessed that it was an Aparo cover. It looks like a Ditko piece.
Probably because Jim's cover was for a Ditko-drawn interior story. Ditko's costume design sense shines through powerfully in that character, doesn't it?
This week I'm voting for Action Ace. E. E. Hibbard's Golden Age Flash work fascinates me because of his heavy use of blacks. One wouldn't think that such a dark scheme would work on a character as "light" as the Flash--and I'm not entirely certain it really does--but it gave a distinctive vibe to the comic, that's for sure.