With these 2 quotes in mind, I fully believe CBS wants to start 1 big, 3 (s)wings and 1 ball handler. Alternatively, 1 big, 2 (s)wings and 2 ball handlers.
Ball handler: Kemba
Wing: Brown
Swing: Barnes (?)
Swing: Tatum
Big: Theis / Thompson / Timelord
Why is Barnes a swing but Jaylen a wing?
I don't see Barnes as being any better at covering big forwards defensively or at covering the backboards.
Tomayto, tomahto. The important thing is that all 3 of them are switchable defenders. Fwiw, Tatum and Barnes are 2 inches taller than Brown. Per cleaning the glass, Brown has played only 4% of his minutes at PF this season (and 4% last season as well). I already posted the respective numbers for Barnes and Tatum.
https://cleaningtheglass.com/stats/player/454/positions#tab-team_efficiency
If you ask me, Brown is a wing. He relies more on explosiveness rather than on strength (unlike for instance guys like Semi or Crowder).
It mattes because the designation doesn't give proper credit to Jaylen Brown for his versatility. He is a three position player - SG, SF and PF.
It matters because by failing to credit Jaylen for his capacity to play PF it in turn overstates H.Barnes' ability to play PF. Yes, Barnes can play there but he is not great there either. He offers no more defensive or rebounding capacity to matchup against bigger PFs than Jaylen does.
The truth is that Tatum is still the one best suited to playing PF on the team even if Barnes is acquired. Tatum is a much better rebounder, team defender and he is bigger with more length which helps him in one-on-ones.
That the trio of Barnes, Tatum and Jaylen can work together is a testament to Jaylen's versatility. He is the one that makes it work. He is the only one who can play SG full time. He is the three position player. He is the one that is versatile enough to make this trio able to play together.
To call Barnes a swing but Jaylen not is to say that Barnes can do something that Jaylen cannot which Barnes cannot do. It is wrong and it does not give Jaylen the due he deserves.