The reason Simpson's eligibility wasnt pressed any further is because he is 18 and does not have to live with his legal guardian to play(as far as I know). This is an investigation by the principle and the school administration to make sure everyone is eligible before anymore district games are played. I don't think they are trying to rush him back before the Cookeville game.
http://www.clevelandbanner.com/view/full_story/9665982/article-Eligibility-is-focus-of-CHS-probe?instance=main_article