Now it's unclear if he still has that burst to be an elite eraser, but he'd still be well above our bar for athleticism in the front-court.
Focus on strength and conditioning work, don't necessarily practice every day, and be ready for 2018-19.
He'd finished rehabbing prior to last season and actually played a bit. At 6'11 205 he's a stick so Maybe they put him on the protein shake every meal live in the weight room plan. Hopefully we go after the UConn wing transfer too.
...which is my way of speculating that he might not have gotten himself back to full strength before playing. The determination to work hard and play ahead of schedule speaks well of the young man; but a sit-out year is an opportunity to revisit rehab, possibly with limits on what he does in practice and how often he practices. That's what Burns did during his redshirt season.
It also is an opportunity to add 20 pounds as you noted.
He's kinda like VJ where he could add 20 lbs of muscle and would look only marginally less skinny