Looks like they have a team full of switchables.
http://www.washingtonpost.com/sports/colleges/georgetown-vs-marquette-hoyas-thriving-thanks-to-versatility/2013/01/04/dd05c51a-56ad-11e2-8b9e-dd8773594efc_story.html
The article focuses on two, Otto Porter Jr. and Greg Whittington.
We do start 4 6'8" players. We switch screens in Man to Man defense. JT3's philosophy is to have basketball players not guards, forwards or centers. He wants guys who can play multiple positions.