Troy Brown has looked much improved throughout his time in the bubble, and Rui Hachimura does not look like a complete loss of a draft pick. Killian Hayes would add to an already-solid young core and possibly could eventually take over the starting point guard role from John Wall.
Hayes is a really good shooter-passer with a high impact on both ends of the floor. He is tremendous in terms of both on and off-ball impact and should continue to be such at the NBA level.
It has been rumored that Hayes could fall a little bit in the draft, and he is a very interesting player to watch in October. The media is seemingly higher on him than NBA executives.