I have flown thousands of skydive loads in 182's and probably 20-30 loads in 206's.
I have had an out of CofG experience in a 206, though not whilst skydiving. Took off with a full load of 6 POB heading to Birdsville, whilst in flight pax moved bags etc rearwards and with the fuel burn moving it further rear. On slowing down in the circuit at Windorah and taking a stage of flap, pitch control became very very dicey, instantly restoring full power, removing flap slowly and then getting all items moved forward again, even had front RHS pax holding a bag or two and normal control was restored.
IF on rotation or in the subsequent pitch up of unknown cause, pax slid aft on the floor a rear CofG could have ensued making control more than difficult?
Hopefully there are clues to this tragic event.
A sad day for aviation and the skydive industry.
RIP