Dude has been Porker status in pressure situations since Harden left town. His postseason TS% has been on par with Paul George's since 2013 & DeFrozen status in the most pressure packed game of every compe ive series:

Gm 4s: If a team were to be down 2-1, a win away from home would swing their odds from 30.7% to 55%. A very significant 24.3% increase. They would have a 55% chance to win even with the series tied.

2013: Down 2-1
-vs. Grizz: 10/27 (TS: 47%) --> Loss w/ him scoring 5 points while going 2/13 in the 4th quarter & OT

2014: Down 2-1
-vs. Grizz: 5/21 (TS: 31%) --> Won b/c Reggie Jackson carried him on his back, no wonder Reggie has been throwing shade at him ever since.

Gm 5s: When a series is tied at 2-2, winning Game 5 becomes imperative with an 82 percent chance of advancing. In NBA history, the winner of Game 5 is 147-33 to go on to win the entire series.

2014: All series tied 2-2
-vs. Grizz: 10/24 (TS: 48%) --> Loss
-vs. Clips: 6/22 (TS: 49%) --> Won b/c Russ went off
-vs. Spurs: 11/21 (TS: 54%) --> Blown the out thanks to the MVP imploding in the 3rd quarter then getting benched in the 4th.

2016:
-vs. Spurs: 8/21 (TS: 48%) --> Won b/c the refs gave him two bogus FTs & Russ kept the team afloat hitting hero-ball shots.

Gm 6s: When a home team is leading a series 3-2, they have an 84% chance of winning the sereis.

2016: Up 3-2
-vs. Duds: 10-31 (TS: 41%) --> lost & got a corny tattoo.

Basically, in the most pressure packed game of every compe ive series he has been part of since Harden left town he has been pretty underwhelming. Dude is a front-runner as evident by how he was hi-fiving everyone at the end of Gm 5 in the WCF then reverted to yelling at his teammates when the pressure got to him in Gm 6/7.