Kiwiblog has a scoop. It alleges that non-compliance with the Incorporated Societies Act may have made Winston's candidacy invalid under his party's rules.
I do not have time to reach any concluded opinion on that matter now. There may be plenty of lawyers looking at the issues next week.
Irrespective of the legality of the candidacy in terms of their constitution I doubt that Mr Peters will want any close scrutiny of his list selection process. An absurdly undefined provision of Electoral law requires that the process be democratic.
It will be interesting to learn the details of NZ First's democratic process.
One word would sum it up from Winston's perspective: "NO"