Secret's out: Pop, at last, is happy

Winning the gold medal Gregg Popovich feared might forever elude him has brought peace to the famously cantankerous coach ... even with the Spurs looking at a third straight losing season

Gregg Popovich will not want to hear this. The strong likelihood is that he will never admit this.

Proceeding with my assessment regardless: Based on what we have seen so far this season, I think he is finally happy.

Coaches supposedly never are, as he unforgettably told my pal David Aldridge in a between-quarters sideline interview on TNT nearly a decade…