Houston (Texas) Klein Oak four-star cornerback Courtland Guillory is down to four schools and ready to make his commitment. On Wednesday, Guillory announced he will make his decision public on Sunday, April 28, with Oklahoma, Texas, Texas A&M and UCF as his finalists. The 6-foot-1, 170-pounder visited both the Sooners and Longhorns this spring, including a visit to Norman this past weekend. Coming out of that visit, it is shaping up to be a two-team battle between the hated rivals. And that’s reflected in the On3 Recruiting Prediction Machine (RPM), where Oklahoma holds a slight edge over Texa…