Terrible news for the community. My thoughts are with the families and friends that are coming to terms with their losses tonight.
As an aside I never felt the parachute obstructed movement, and the all round visibility with the Tutor's big dome canopy is very good, even more so compared to most other light aircraft. Its so easy to fail to see another aircraft, especially in airspace as busy as ours: and even more so when the other is such a small aircraft with hard to see cross sections...