Jeff Foxworthy has more than one purpose for GSN, not just American Bible Challenge.
I actually got a chance to watch an episode of The $100,000 Pyramid the other morning to realize that 5th Grader was coming up soon. In the past few years, there has only been one show that has maintained a good boundary between classic shows like Match Game and Card Sharks then modern shows like Catch 21 and Chain Reaction.
When Chuck Woolery's Lingo got its noon slot back in 2010 after The Newlywed Game and Baggage were attempted [don't know what Kelly Goode was trying to get at there], Lingo stayed in the noon hour until May 2012, then remained at 12:30pm until October 2012. Within the past year, Chain Reaction, Jeopardy! and Whammy! have all been tried but nothing has worked.
5th Grader remains at 1pm, with in the past week of ratings, not one weekday airing below 250,000 viewers, and even the Monday slot had 306K, very impressive for 1pm. A couple other ideas have been thrown around to separate classics from moderns, including Regis' Millionaire and Greed, but so far 5th Grader shines.
Reruns of 5th Grader on GSN in general are still working well, consistently in at least two of the top 30 slots a week. During the week of March 18-24, 5th Grader on Sunday night had the 9th and 11th slot of the week, rising from the American Bible Challenge lead-in a few hours before.