Recently on the Worldview Times site, there was an article by David Reagan which addresses the Gap Theory.
Seems he had been unfairly accused of believing it.
The article was his response and explains not only that he is not an advocate of that theory but he clearly and succinctly explains the Gap theory and another theory (The Day Age Theory). Both are equally untenable and he explains why.
I think you will find this article most interesting and informative. HERE’S THE LINK