Since 2013/14 (the season CBS took over), our only traditional starting Center has been Tyler Zeller in 2014/15. Clearly, he wasn't a long-term option for the C's.
2013/14: Sully (started 44 games that season playing alongside Brandon Bass)
2014/15: Tyller Zeller
2015/16: Sully or Amir (they were our starting duo at PF-C)
2016-2019: Horford
2019/20: Theis
It seems that CBS loves his undersized big men. Unless you are proposing we should move on from CBS, I don't see us changing our defensive scheme (neither do I want us to change it for that matter).
Baynes started 67 at center games in 2018.
Fair enough. Even so, our most used lineup in the playoffs that year was with Marcus Morris instead of Baynes.
most used lineup (121 minutes)
Rozier - Brown - Tatum - Morris - Horford
2nd most used lineup (85 minutes)
Rozier - Brown - Tatum - Horford -
Baynes3rd most used (55 minutes)
Rozier - Smart - Tatum - Morris - Horford
4th most used (54 minutes)
Rozier - Brown - Tatum - Semi - Horford
https://stats.nba.com/lineups/advanced/?Season=2017-18&SeasonType=Playoffs&TeamID=1610612738&sort=MIN&dir=1Baynes started in 12 out of our 19 games, but he was only playing 20.5 minutes per game.
having a big man anchoring should help us hide Walker
I strongly disagree with this take. The way our pick n roll defense works right now, Theis meets the ball handler at the level of the dribble hand off and denies penetration. If we had a slow footed big man who drops back to protect the rim, opponents would just blow by Kemba. Remember the series against the Sixers? This is exactly what we were doing against Milton and Embiid (both below average pick n roll defenders). Kemba got tons of open shots in that series. Here's the play we kept running. It's just a simple pick on the perimeter, yet the Sixers were unable to defend it.