Earlier this season, we did a full write-up and scouting report on Barnes. His game hasn't changed a ton since then, other than some disappointing performances in the NCAA Tournament. But watching Barnes season in totality left me with this feeling that his upside is very Giannis-like. His massive hands are apparent. He is incredibly at attacking the rim downhill and makes good decisions when doing so. The rebound-and-run or open floor potential is massive. He can defend almost any position due to his length and athleticism.
Barnes has two main struggles: shooting and rebounding. The shooting will change how he's played in the half-court. Think about where Giannis was his third or fourth year in the league... that seems an appropriate ceiling for Barnes if he never figures out the shooting. The major issue for me is the lack of willingness to rebound or be physically imposing. Barnes can't be out there as a 4 and fail to impact the game on the glass.
To me, he's a top-eight lock. I have him #6 right now, and he'll toggle somewhere in the 5-to-8 range up until draft night.