First and foremost, congrats to Wales for playing an impressive 65 minutes or so. I think for that amount of time they were on par with the ABs, perhaps even a tad better. ABs are the only consistent 80 minute team in World Rugby and showed again tonight why that makes such a difference.
Re first five - for me that game confirmed the fact that Barrett is a much better option of the bench. He was stunning from the time Slade came on, before that I thought he was rather disappointing, decision making was poor, in game kicking was not great, and goal kicking below average as well. He had a chance to prove he was a contender for the starting 10 spot, but I feel he did not take his chance. In the last 10 - 15min he was fantastic.
The abilities of Carter and Cruden to control a game are far superior to Barrett and for that reason alone they will be (and I think are currently) the preferred starting 10s.
Slade is making waves, but without getting a chance to start, he is not really in serious contention for starting 10.