I must interject here. Don Heck was one of the most prominent Atlas artists of the 50s and early 60s. He had a distinct style and did fantastic work on fantasy, westerns and war titles..not to mention the early adventures of Iron Man.
His work on the pre-hero fantasy titles is just as good, IMO, as the stuff Kirby and Ditko were doing.
I understand your statement. At the dawn of the Marvel age, Heck was asked to ape Kirby's style and, I always found it lacking -- especially some of his later Avengers work.
Not to de-rail this thread...but is one of the most dynamic Atlas covers, done by the master:
A classic....a shame Don never did more pre-hero covers!