Defense is extremely difficult to quantify. No one has really been able to figure it out the way we have with offense.
Just pulling up some basic stats from NBA.com, Sabonis leads the team in defensive FG% allowed at 54.1%. Among rotational players, the next 3 worst are TD (53.3), Huerter (51.4), and Metu (51.2).
https://www.nba.com/stats/players/defense-dash-overall?TeamID=1610612758&dir=D&sort=D_FG_PCT. You would say that this stat favors guards because of lower 3pt % compared to 2pt %, and I would agree. Which is why I think it would make more sense to compare Sabonis' defensive FG% allowed with the other two bigs on our teams.
If you take a look at Sabonis' defensive dash board for defended FGs, his % are worse than both Metu and Lyles in almost every category, minus 1 for each:
Sabonis -
Lyles -
Metu. If you don't want to compare all the numbers, their overall 2pt % stands as: Sabonis (56.5), Lyles (51.6), Metu (55.5). I decided to compare their 2pt % in this one compared to the overall team's in the last comparison because ideally, they'd all be facing similar defensive assignments and tasks. However, you could argue that this stat favors the bench guys because Sabonis faces starters, while Lyles and Metu face backup guys which makes their assignment easier and helps their dfg %.
Def rtg is also flawed as it's heavily dependent on your overall team and lineups you have on the floor. There just aren't any reliable stats for defense out there available to the masses.
Based on the eye test, it seems like Sabonis doesn't offer any protection at the rim (0.5blks/game would also support that). Opposing guards are easily able to get into the painted area and it constantly feels like an easy 2pts because we offer no resistance at the rim. This forces our wing players to help down-low, often leading to wide open 3s for their wing shooters. It's evident that our bad defense is an entire team issue starting with the guards. I think it gets easy to put blame on Sabonis when he's quite literally the middle cog to our defensive woes.
I hope others don't take this as me crapting all over Sabonis. In my opinion, he brings elite offense to the table and it 100% offsets any negative defense.