Okay, that actually does answer the question. It appears to be an accident of that election rather than a feature of the system.
The other question I want to ask relates to something that happened in New Zealand. A number of people elected under Winston Peters' New Zealand First party proceeded to bail out of that party and go to other parties. Mr. Peters, who held the balance of power, then demanded that an anti-party-hopping bill or anti-ratting bill or anti-floor-crossing bill be passed. It was, and it then had disastrous results in which another party unexpectedly was effectively destroyed because it couldn't split into two factions.
How did that situation resolve itself? What is the status quo in New Zealand? Is anti-party-hopping done anywhere else, or is it simply ruled out in most MMP jurisdictions, to the extent that you have any knowledge?