Does success equal “grit”?

Here’s a short TEDtalk (6 minutes) suggesting that we can link success to the measure of “grit”. Grit, by some definition, seems to be the combination of passion and persistence, and is linked to having a “growth mindset”. Silly me, I thought “grit” was just part of the title of a Western about an old, drunk, gunslinger and a persistent little kid…