I'm not really sure how good Thompson and Green really are. I think they both have benefitted a great deal from playing with Curry and in that system. Don't get me wrong, I'm not saying they are bad or anything, I'm just not sure either of them is really a top 15 player (despite them appearing on the All NBA teams).
Two key things, to start:
- They are both excellent shooters from three; Thompson is one of the best in the league.
- They are both excellent defenders capable of switching and covering multiple positions
Right there that gives them a baseline as two-way players with a lot of value.
Then you look at the fact that they are both decent playmakers who are capable of taking advantage of weaker defenders 1-on-1, and have shown the ability to "blow up" offensively in big games. That gives them the ability to carry a large load when necessary.
Klay and Dray led the way during the playoffs when Curry was out last year, and they did not appear overmatched, even against solid opponents.
A team built around Klay and Dray with a solid supporting cast would win 50+ games and have a shot at getting past the first round.