I think this and my recent frantic defense of Jack from narfstar's brutal assault officially make me the Krazy Kirby guy. Hopefully you won't see me trying to get you to buy prints or donate to kickstarters at the next convention you go to. Ugh, I think I'm gonna go read Tor a few times, or maybe some nice, wholesome LSH. Maybe listen to some Roger Miller--wait, did Kirby like Roger Miller?! What Kind of music did Jack Kirby like!? I'm gonna go curl up in my closet with some Ghost Rider until This strange urge to draw dragons that look like people goes away. Where do I keep my Legends crossover?! Save me Ronald Reagan!!! Wait... No. Darkseid!?!? Why does Darkseid have to be in every dumb crossover?!?!
... It is very late. 
I don't know about the Kirby defense, Rick, nor do I have any clue as to Jack's musical tastes. However, a good guide to deciphering unknown early work is to try to put it into context. Check the Who's Who and/or GCD sorted by Date. A quick glance at the WW will tell you that his earliest work at S&K Studio was 1953/54 and his earliest published work was 1953. Steve's been researched fairly well over the years and two recent books about him surely would have turned up something about him working in comics two years before everyone thought he started.
FWIW, I don't see any connection between the interiors and the cover artist. Victor Fox was a notorious low-rider in the late Fifties comic world and the only folks who would work for him were newbies trying to build a portfolio at any cost and tired old hands working for cigarette money. Neither group could count on getting paid. Even Jerry Iger eventually gave up on Victor Fox, again. As did the comic book marketplace.
Peace, Jim (|:{>
