I actually agree with the KG-Odom comps (1000x better than Giannis comps I've seen), the one thing he lacks from both of those guys though is vision/feel for the game/knowing where to be and where/when to move. And to come close to being another KG he has to really ramp up his strength and explosiveness in traffic. He's got great athleticism for a big and shooting upside (not quite there yet) which is why so many internet fans are in love with him. He's definitely a project but I agree he most likely goes in the late teens/early 20s, can see the Celtics taking him (or the Pistons if he gets there).
The Pistons wanted Draymond Green because a playmaking+shooting+defensive PF (which is what he'd have been) is dream-level perfect for the SVG system. You're right they like versatility and that's why they have Morris and Harris, and of the SG-SF variety KCP and Stanley Johnson. And they even have depth behind those guys, the only position group with real depth. Saying this as a Pistons and MSU fan (and someone who studies the draft in depth) I think there's next to no chance the Pistons take Valentine, you can only have so many guys playing the same position on a 15-man roster
Thanks man for the positive post dude.