It was reported in todays Dominion Post that the solo pilot landed sans engine power and front wheel. Perhaps one aircraft descended upon the other?
The image of the surviving aircraft I've seen on the news shows it also missing the top half of the engine cowl, possibly it's been removed post landing, but looked more torn off.
I can't find a static image of it, but it's in this video at about 1 minute in...
Husband remembers wife lost in Feilding Cessna crash - National - Video - 3 News