Is there anything we don't already know in the article?
My understanding, Penn State was going to invest a lot of money in wrestling to build a new facility, and provide the wrestling program with a bigger budget, along with providing Cael a higher salary. At the time, Iowa State didn't have the funds/budget to compete as we just didn't have the money or funding available to invest in wrestling. Thus, he left.
The irony is that none of that stuff, other than his salary, wouldn't have mattered. At the end of Gable's tenure Iowa could have wrestled on gravel in Siberia and the same recruits he got would have followed him/wrestled anywhere.