The complete top 5 list is:

1. Donovan Clingan (4.3)
2. Victor Wembanyama (4.0)
3. Amen Thompson (4.0)
4. Greg Oden (4.0)
5. Jaren Jackson, Jr. (3.8)

(Source in the comments because the automod apparently hates the website)

I know it’s difficult to take a lot away from summer league but there are notables on that top 5 list (Wemby, JJJ) who are excellent rim protectors at the next level (yes I am aware of the irony of Greg Oden being on here as well as a blazer fan).

Either way I am optimistic that Clingan can be a force for years to come at the defensive end. Excited for preseason and training camp.