He is a quick jumper, very long, strong, and actually has good timing wrt blocking shots

Is he consistent? Absolutely not. He needs much more time there to be consistent. The things he struggles with defensively are things he has to be immersed in and get used to.

I can take a kid who knows everythinf about defense, where to be, when to switch, when to hedge, etc. And if he is 5'9 and slow there's not much I can do with him.

Ojiako has all the physical capabilities coupled with enough of a mental makeup in a short career to project he will grow exponentially within your program. And obviously not just defensively