MIAMI — First-year manager Skip Schumaker didn’t know what kind of hitter he had in Jesús Sánchez at the start of Spring Training. Sánchez had a down season last year — he hit .214/.280/.403 — and was facing a pinch to make the Major League roster when the Marlins decided to move Jazz Chisholm Jr. to center field. Sánchez started the spring hot (11-for-34 in 13 games), before cooling off. “I was trying to figure it out all Spring Training,” Schumaker said. “[He] didn’t have a great Spring Training — it was okay, it wasn’t great. I think he was…