Pitt fan here... Pitts assistant coach "Slice" has a relationship with his dad. They played together in Poland. You never know with kids who commit this early. They did answer that question in an article though.
Heron said they watched film and Pitt live and that he feels he is a great fit in the offense. I believe Pitt sold him on him basically being a point forward like Patterson plays now for Pitt. They told him he could bring the ball up at times, play off the ball, and even post up.
He said he committed early because he really liked the coaches, players, and how he fit in the offense. He also said he did not want to deal with the daily calls etc that go with his recruiting. His dad also said he wanted his son playing for someone he knew because then he knew he would be taken care of.