Someone told me Duncan, Durant, Kawhi, etc. have only lost in the Finals once

[Rico2016]

Is this true and if so then who was the only one to ever beat these three legends? What a mountain of a guy if one person handed all 3 their only Finals loss.

[ImKobe]

Ray allen and Kawhi/Manu missing FTs beat Duncan/Kawhi, Durant was like 10 years old when he first played against peak Lebron and he still outplayed him in that series.