From my viewing, Harris was the standout over both games and should lock down the No 8 spot.
I am also impressed with Tafa, and have seen him play lock for Northern Suburbs. He could well come in for Ha'angana who I thought was a bit disappointing in game 1.
I would have Robertson over McDonald every day of the week after watching their respective performances.
A poster commented before the Fiji game that Donaldson would ensure the outside backs got more ball that they did against Japan. I recognise the weather intervened, but that just did not eventuate in the second game. The ball got to the wingers very sparingly, and when it did, Tui in particular was very impressive. I think the weather might just be an excuse. Stay with Harrison.
I am more concerned, though, with how ineffectual the scrum was in both games. None of the props seemed to get on par with their opposites. So out of character at this level from previous years. Where are the Lomaxes, Falelai Siones, Shambeckler Vuis etc? Could well be in for a thrashing from the Baby Blacks if the scrum continues to fold.