The fast-casual stock is losing the leader who oversaw its most exciting growth.We recently learned that Chipotle's (CMG 0.49%) highly successful CEO, Brian Niccol, has been hired by Starbucks (SBUX 1.72%) to turn the slumping coffee giant around. Should Chipotle investors be worried, or is any weakness in the stock a long-term buying opportunity?*Stock prices used were the morning prices of Aug. 20, 2024. The video was published on Aug. 21, 2024. ...