I'm going to say Chriss.
He's listed at #4 on that link right now, and I honestly don't think he's worthy of that given how high a risk he carries.
He looks far too much like Jeff Green in every imaginable way, from the lack of rebounding skills to the physical attributes to the (relative) lack of intangibles.
On the other hand I could see Poeltl jumping unexpectedly. Athletic, defensively versatile, two-way seven footers with strong intangibles don't come along often.
His ceiling might not be perceived to be that high, but he's only 20 years old and already has the talent and physical attributes to play significant minutes in the front court.
Loving that mock either way though - if we get Dunn, Davis, Valentine, Johnson and Makerwith our top five picks I'll be beyond thrilled.