Handle is more than flashy crossovers or whatever Kyrie and Steph are doing. The question is whether a player can get where he needs to go with the ball in his hands, while brushing through screens and trying to avoid defenders. I think Dante has a solid arsenal of moves. He has and in-and-out, he has a crossover and the one he broke Oladipo's ankles with was an in-and-out crossover which is a somewhat advanced move and if I remember I've seen him do it successfully with the Australian national team too. I think his left hand is not up to par, he doesn't have great control with it and needs to improve it. In general, he has functional handle, but I'd like to see him tighten it up a bit, especially in tight spaces - he had some turnovers last year losing his handle when going in traffic. I'd also like to see him add more hesitation moves.
His right to left crossover rejecting the screen is a deadly weapon combined with his speed, it's so beautiful and smooth. He leaves opponents in the rear-view mirror without ANY chance of catching up. In last year's summer league he left Smart about 8 feet behind him in a split second before Smart even realized what has happened and started moving. And that's Marcus Smart the new Tony Allen-like perimeter defender. If he perfects it and gets some confidence in it, opponents would have to compensate for it and open up middle and that's death to defenses.