This might be a stupid question...

I've been looking through several Carl Hungness yearbooks from the '70s and '80s lately, and there are many articles written by Jack Fox, and others (within the same issue) written by Jack C. Fox. I assume this is the one and the same person. And if so, it just seems odd that some of his articles include his middle initial and others do not. His "Illustrated History of the Indianapolis 500" (1994 edition) includes his middle initial.

Or am I totally wrong, and Jack Fox and Jack C. Fox are two different individuals? I suppose that's doubtful, but thought I'd ask.