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Obviously, after having played only 9 games the lack of sample size contorts reality. Still, it is interesting to see who has been performing for the Pistons during their 4-5 start. 9 Pistons have met the threshold of 110 minutes played. Of those, 3 are in the NBA's Top 50:

1. Christian Wood (20th): Off: +1.8 Def: +5.9 Total: +7.7 (He is currently sandwiched between Embiid and Curry/Harden )
2. Langston Galloway (39th): Off: +4.9 Def: -0.2 Total: 4.8
3. Andre Drummond (41st): Off: (+0.4) Def: +4.3 Total: 4.7

So, there you have it. Our top 3 performers.

Derrick Rose has been the only other positive (+1.0 total). His terrible defense (-5.4) has been offset by his great offense (+6.4).
Luke Kennard has put up the 3rd best offensive numbers (+3.8) but that has been counteracted by his awful defense (-5.0).
Snell, surprisingly, has been a net negative on defense (-3.8).
Markieff Morris and Thon Maker have just been putrid (-7.9 and -8.6 respectively).

https://projects.fivethirtyeight.com/2020-nba-player-ratings/

Wood's on/off must be really good. He's making the best of his opportunities and thankfully keeping Thon on the bench. Thank you Mr. Wood! I'm surprised his defense score is that high. He missing rotating all the time. Lots of free shots.

D Rose does really have bad defense. With his elite athleticism he should be average just based on running around with his guy and staying in front, but he gets lost a lot. Many shots are him looking around, and running to the his guy shooting and making something over him.

You know it's a valuable stat if wood and Embiid are neck and neck.

We do have 5 guys shooting over 40% from 3 right now and are #4 as a team. Langston and Wood are both on that list too.

The offense, overall, has been good. Kennard's improved assertiveness, Drummond's step up in efficiency, Wood and Snell shooting well, Rose shooting well from two, etc.

The defense is hot garbage. Drummond is trying and everyone else looks like a turnstile.