Unless the pilot did it on purpose or was negligent in some way, they shouldn't be punished at all: It's terrible, but the article isn't very specific on how this happened in the first place.
Not really, this is standard practice for skydiving planes. The sooner they land, the sooner they can pick up the next group. I've gone on plane rides at these places and it's like a rollercoaster drop as soon as the last person leaves.
The pilot may be partially at fault, but this is common practice in the space