Yes, to the first question. To the second: It depends on the program. The school he is at has two main Grad level (Masters) programs, an MA - two years fulltime, and a THM (Master of Theology degree), which is four years fulltime. Many other schools also offer a three year degree, a MDiv (Master of Divinity). Dallas Theological Seminary is a non-denominational school. It's one of the largest and most respected in the country (among evangelicals). Tom Landry was on the Board of the school when he was alive, and over the years there have been many ex-pro athletes that have attended there. David Klingler graduated just a year or two ago. Here’s link to their website: www.dts.edu
Concerning your second observation, that is so true. If Preston intends to be involved in ministry to them, he will have a wide-open door of opportunity. And being an ex-player, he will have a platform few others would have. I hope he succeeds and does well.