A year after Chipotle's old CEO took the helm at Starbucks, here's what's changed.Former Chipotle executive Brian Niccol, who presided over a doubling of Chipotle's (CMG -0.60%) sales in his six-year tenure, was seen as such a big get for Starbucks (SBUX -0.24%) that shares surged 25% the day it announced he was the incoming CEO. But that was then. Since September 9, 2024, when Niccol took over as CEO, Starbucks shares have fallen by 6%. For context, the Consumer Discretionary Select Sector SPDR Fund (XLY 0 ...