The missing piece is Bradley Beal

[Dundalis]

I've seen him play good defense before. That doesn't mean he's a good defender, but it does mean he's capable of being much better than that, especially if he's both on a good team, and also not required to be the primary offensive weapon for his team (or at least share that with Luka, which would help both their defensive games). If you brought in someone of his offensive capabilities, you could afford to go all defensive, limited offensive player as the fifth starter alongside the star trio and DFS, which would be much easier to acquire. KP, DFS and another good defender would be enough defense when you have the consistent offensive punch of a trio like that. That said, it's obviously a pipe dream given our lack of tradeable assets. We will have to get incredibly creative to get any type of star player in a trade.