True, that's why they also given up something in return getting KD, they don't have the twins anymore which is their perimeter defender and willing to sacrifice their body. So we will see if the acquisition of KD is worth if they get into the finals as least.
Both the Mavericks and the Suns did that. They've traded their defensive players plus their draft picks for 2 of the best all-star players in the league right now. As for the Suns, there's no problem with them offensively especially their starting 5 is for me one of the best on paper this season and on the other hand, KD is also a great defender with around 1 BPG so it's still ok for the team. The question is the health of their players. Booker, Paul, and Durant has a long history of injuries.
Also take note that CP3 is known for being the best choker when it comes to playoffs. We have Coach Doc Rivers as the coach who is choking on the playoffs, and we also have CP3 who is also choking on the playoffs. CP3 is the only player who blown out 2-0 lead 5 times. Will CP3's past performance on the playoffs affect his whole team this season?