Outstanding Question
According to the preliminary report, the first witness states that "both planes were on the downwind leg", and the second (later) witness said that just prior to the collision they were flying in opposite directions". And we know that they clipped their right wings.
This raises the question: Was the smaller plane doing touch and goes using the smaller parallel runway to the South of the main runway? It's hard to visualize the movement of the planes in the pattern. This info is missing.