It’s kinda hard to find a comparison because of all he does well. He is an energy guy, blocks shots, plays d, shoots the 3, rebounds, high IQ, stays out of foul trouble, shoots free throws well, has a decent mid range game, and is self-aware, a hard worker, and teachable.
His weaknesses are lower body strength, passing, post up game and lateral quickness. Lower body strength is easily resolvable with gym time. Post up game is not even a thing in the NBA. Lateral quickness can be trained somewhat with stretching and technique but will be the one thing that will probably remain. Passing might be a vision thing. Those goggles have to limit peripheral vision. It’s rare to find a young player that ticks so many boxes.
He does not have the physical presence of Wiseman, who I think will be a star, or the electricity of Toppin, or the strength of Onwangu, but has a combination of assets they don’t have either. His floor is solid NBA contributor. His ceiling is solid NBA starter.
He is an energy guy. When you watch him play he clearly plays with more effort than Ayton (or most other NBA bigs). That’s what I liked about Toppin too. It’s one of the things that sets Siakam apart. I think most bigs get gassed quickly. Ayton certainly does.