Chemistry is so important too. I'm positive KD having been on teams with Curry and Booker was so critical to them not breaking at the end.
Sometimes players feel like they got to take it themselves and not defer, but when you know you got a KD on your team you trust they can make the play.
KD/Curry/Booker know when to give/take w/ each other. I really think that was such a big factor in that last quarter as was LeBron's history with KD.
There's no guarantee LeBron/KD/Curry/Tatum works better because Tatum doesn't have the years of familiarity with the others. Like the decision LeBron had to pass it to Booker who passed the ball to LeBron and LeBron made the decision to pass it to Curry for the lead. There's no telling if Tatum decides to shoot it instead or drives it. Those guys did a really good job limiting mistakes and forcing the other team into more.
The lineup was the lineup: Curry, Book, KD and LeBron played all 10 minutes that 4th quarter and they're the ones who came back with Embiid.