The two best players, IMO, are Zion and Morant, but they aren't surefire, can't miss prospects. There are legitimate concerns about how well Zion's game will translate. I personally think Morant would have been an interesting pairing with Sexton but bigger guards may have been posting them up all game.
Odds were the Cavs would be drafting somewhere between 3 - 6. It was always going to be a bit of crapshoot with that group of players. Who really knows if Culver will be better than Hunter, etc etc.
The Cavs could still end up with the best player in his draft, or a very good starter.