"Vic Verity" and "Don Fortune" were published between 1945 and 1947. Fawcett's publication of Comic Books continued until late 1953. Pete Costanza continue drawing for Captain Marvel stories and other Fawcett titles until Fawcett stopped their production in 1953. So what would Costanza's drawing for "Don Fortune"/"Vic Verity" in 1946-47 have to do with "hectic times" after Fawcett closed down their comic book production in 1953. Do you mean that Costanza worked simultaneously for several comic book publishers during the 1940s, but starting in 1953, when he lost his Fawcett work, he had to scramble to get work from other sources? He started working for Gilberton's "Classics Illustrated" immediately after his Fawcett work stopped, and later worked on stories in ACG's "Forbidden Worlds".
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Vic Verity Magazine 2