Looks to me like the skydivers climbed out, created drag, pilot failed to compensate. He either couldn't see the lower aircraft in the first place or lost sight when the organ donors hung off the strut and/or he allowed the aircraft to drift to the right and descend.
While you might think that I couldn't possibly comment.
It was very lucky that there were neither fatalities nor serious injuries. Just as well that the 182L pilot was wearing a parachute after that wing loss. It wasn't the first time that aircraft have collided in-flight and it won't be the last ! Plenty of beers in the bar that night I suspect !
Iceman
You are still dangerous! You can be my wingman anytime.
It was over Superior Wisconsin. Wherever the aeroplane landed it would have improved the environment. Whoever called it Superior proved that irony is alive and well in the USA*.