Jeff Guyton picked an interesting time to move back to the U.S. from Europe to take over as president of Mazda North American Operations just more than 14 months ago. The brand's first redesigned model under its new "premium" image — the compact Mazda3 sedan and hatchback — was headed toward a disappointing sales debut after a price hike and a wrong bet that offering all-wheel drive would entice Americans out of their crossovers.