Even if you use true shooting, Wiggins’ is an inefficient high volume scorer. Even Lance Stephenson has a better true shooting percentage (.545) than Wiggins (.490) this season! Wiggins has been so bad this year in particular, he’s barely more efficient on offense that Lonzo (.487).
BTW, I noticed that the offensive and defensive ratings for the same players are different, depending on the site.
On NBA.com: Wiggins has an ORtg of 112.2 and a DRtg of 109.3, while Kuzma has an ORtg of 107.5 and a DRtg of 107.4.
On Basketball Reference: Wiggins has an ORtg of 100 and a DRtg of 114, while Kuzma has an ORtg of 106 and a DRtg of 110.