Kelvin Davis becoming her deputy is also a smart move because he is not seen as one of the boring policy wonks who always put their hands up for Labour leadership roles.
He is, by all accounts, a hard working MP and has shown he has leadership credentials. Being most likely the first Maori deputy leader does not hurt the party's cause amongst Maori voters either.
Whether this change will help Labour's chances remains to be seen, but it certainly puts a bit of excitement into the race. It gives Labour a point of difference, because it could have been argued that Bill English and Andrew Little were remarkably similar in style, ie: boring.
There are some who say all this turmoil plays into Winston Peters' hands and they are probably right.
While a National Party led coalition still probably holds the advantage, don't bet against a Labour, Greens and New Zealand First government.