All three have some above NBA average strengths (as noted by others). And all three have some fairly serious weaknesses that hold them back.
But i think it's fair to say that the Cs should be investing in Williams' comfort on the court now, as a means to him being a better, more consistent, more patient player by the playoffs. He's pretty erratic -- and again, a little too rushed all the time -- but shows 2-5 minutes stretches of being a major presence.
I agree with Roy he's doing well as a bench guy. Don't want to heap too much on his shoulders too quickly, so i think you keep him out of the starting line-up. But I do think his minutes should creep up signifcantly over the next 4-6 weeks if the Cs are smart, because his potential to impact games is undeniable.
I'd add -- as was my call in the "bold predictions 2021" thread -- i'd not be surprised at all to see Theis get traded this season.