Throws like the one to Thielen and then the fade for the TD are what win playoff games! Cousins seems to be maturing into a more clutch guy, like a lot of QBs do--Russell Wilson, for example.
I actually think Josh will be capable of this kind of stuff sooner rather than later, especially if he has a Thielen-level receiver--he put a number of throws on the money against the Texans, but it just didn't go our way. In two years, he should be a serious force, and in five, at age 28-29, even better.