Here is the thing: Sopoaga may or may not have set the world alight at 1st 5/8th. If you read my initial posts regarding Sopoaga - both before and after the squad was named - is that he was probably my slight preferance to be there considering we have Barrett in utility.
With that said: expecting Sopoaga to perform in a totally different environment after one game is also very optimistic. It was likely a choice between weighing up whether to take a player in good form, or a player who is used to opperating within the environment you have worked on developing over four years. While I may have taken a punt on Sopoaga - it was hardly a strange decision to go with Slade. While we have seen a similar campaign to see Naholo be rushed in as our starting winger - it doesn't mean they are certain to deliver based on SR form (that said I hope he has a crack against Tonga from the bench).
Finally, I don't think the All Blacks problems can really be isolated to one players performance. Carter probably could be taking the ball to the line more, and all goal kickers could have had better games, but our issues aren't our players abilities imo - it's the execution of the gameplan.
We're pushing a lot of short passes into players running into gaps - but for whatever reason - be it the rush defences reading it well, players aren't being as accurate in contact as they should be, or they are pushing the passes a bit too much - it's accross the board. It doesn't really matter who is playing at first receiver - if the gameplan is to give the short ball to the second receiver who won't catch it in contact. Accuracy needs to improve but, the silver bullit isnt one player.