Reality
Make your own luck.
This^^^....It's strange because he put up 30 a game, but seemed damn near nonexistent at the same time.
Complicated to explain.
Not only that, but he is mad reckless with the ball and has these goofy ass missteps in pivotal moments. In the 'Bron series he tried a behind the back pass to Klay that went out of bounds. In G6 he tripped over his own feet and then got saved by the refs with a call. Tried to split a double team with a behind the back pass and almost lost the ball.
He responds to pressure in the opposite way Klay does. Klay elevates his game when the going gets tough. Steph's entire body language changes - the smirk goes away, his arms hang a little looser, you can tell the moment gets to him even thought it's not a complete meltdown where he's passing the rock or not taking shots (ala 'Bron 2011...not enough is talked about how Bron turned it around mentally after this game, btw).
Part of me thinks it's because he's never truly had to be "that dude" for his squad. Klay's always been there.
**EDIT** GSW fans are trying to make the ridiculous assertion that how you operate under pressure and under bright lights doesn't matter in terms of your standing. That argument should be ridiculous on its face.
We're going to see what Steph's really about mentally this coming year though.