On the "how good is Luka" thing, I wanted to look at his stats more closely and also look at the combined Tatum + Brown vs. Luka + Kyrie.
Luka, based on: 41.5 min / 22.3 FGA / 31.3 usage, is putting up 28.8 pts / 9.6 rebs / 8.8 assts / 43.8 FG% / 34.3 3P%
Tatum based on: 40.5 min / 19.6 FGA / 27.9 usage, is putting up 26.0 pts / 10.4 rebs / 5.9 assts / 44.2 FG% / 29.0 3P%
I think most would argue that Tatum is the better defender. And this is with Tatum only shooting 29% from 3, well below his career mark. Also, Tatum is getting 7.9 FTA, Luka 7.3 FTA. Luka is really good. That rightfully is getting a lot of attention. People are forgetting that Tatum is really good too.
Luka + Kyrie is at: 51.6 pts / 13.5 rebs / 14.0 asst
Tatum + Brown is at: 51.0 pts / 16.5 rebs / 8.5 asst
Pretty even on the core box score stats. I think the assists is an indication that DAL is either a shot by Luka or Kyrie or 1 pass for a lob dunk or kick out 3. BOS moves the ball more with multiple passes before a shot. Team assists is 23.6 BOS and 22.4 DAL. More people than just Tatum and Brown are getting assists. This is exactly as it seems, pretty even top 2, maybe an offensive edge to DAL but a defensive edge to BOS.