Looking at the stats our tight five made an almost unbelievable amount of metres with the ball. I seriously can't recall seeing stats like these ever before (ESPN)
Combined the starting five + reserves made 60 runs, and made 126m (!)
And it was shared around too, all of the starting 5 had 8+ runs and made double digit metres
NZ - 33 runs and 73m
Comparing with the SA match, we had 22 runs and 14m, SA had 28 and 27m
The Argie match, we had 28 and 85m, they had 39 and 63m
Rather than looking at the carrying stats in absolute terms, I think you need to weight them by the amount of possession each side has. If a team has double the possession you'd expect them to make about double the carries. The match stats tells us that the Wallabies had 65% possession overall, which equates to 52 minutes of possession/attacking time. They should naturally, then, have a lot more carries and metres gained than the AB's and their 28 minutes of possession.
This is what you get if you quickly weight those carry numbers by the minutes in possession:
What do we find from a quick look? Well, as I think most would expect, Hooper and Savea were the most involved in their respective packs running game. Hooper carried 3.46 times per ten minutes of Wallabies attacking time, and Savea 3.21 per ten minutes of All Black attacking time. Though there's a bit of a discrepancy in their metres/carry, where Savea was comfortably out ahead at 6.67 m/carry, and Hooper at 2.28 m/carry. I suspect Savea's ridiculous dummy that allowed him to race off down field for a big gain is responsible for his large carry metres.
There's also a clear difference in the carrying contributions of starters and reserves between the two teams. The Australian starting pack accounts for 89% of the overall carries in the forwards, and each had 8-18 runs, equating to 1.54-3.46 carries per 10 minutes of possession. None of their reserves, however, carried more than once per 10 minutes of possession. Meanwhile the NZ pack is more-or-less the opposite. The bench accounted for 45% of the forwards overall carries, and all had at least one carry per 10 minutes of possession. In the starters, Coles, Savea and Read did most of the heavy lifting in attack, though Read wasn't that effective.
The reason for this difference? Likely a mix of game-plan and context, I'd guess. The AB's game-plan has the hookers as primary attacking threats out wide, and Savea is the
de facto #8. I believe their forward assault leading to the try came one the reserves were on (?), which might explain their increased involvement as that was something like a ~20 phase sequence.
With regards to the Wallabies, their involvements are much more evenly distributed among the starters, which backs up the observations that it was an all-round effort with no one shirking their duties. As for the reserves low levels of involvement, could simply be the match broke up and got more frantic by the time they arrived, with the backs likely having greater prominence. You'd have to go back through the previous tests to figure out if it were something to be concerned about.