the pilot involved in this situation is definately not at fault! i can assure you all he is an IFR driver (with about 6000 hrs!!) so there is no issue with respect to the aircraft punching up through cloud.
with the clowns in the back however it is a different story! yes it is up to the pilot to get them up there.... but it is their decision to exit.
the art of "spotting" (the jumpers deciding, after accounting for wind strength, where to exit) which is taught to all student jumpers is quickly being forgotten.
too many jumpers are relying on the GPS spot from the pilot (even on blue sky days).
it is the jumpers who are breaking the rules in this case....