Frank Schwindel has been crushing MLB pitching. Is that sustainable?

Photo by Mitchell Leff/Getty ImagesFrank Schwindel has been one of the best and most enjoyable stories surrounding the post-selloff Cubs.

In 41 games and 169 plate appearances for the North Siders, he’s hitting .365/.414/.679 (57-for-156) with 11 doubles, a triple and 12 home runs. That’s already gotten him a National League Player of the Week award, and accolades from Cubs fans who have enjoyed his happy-go-lucky attitude toward playing the game. He’s an easy player to root for.

He also has the most wonderful facial expressions:

Brad Rempel-USA TODAY Sports He’s also 29 years old (will turn 30 next June) and has never really done anything in the minor leagues that would have suggested he…