Al Horford is moving on from Boston, the latest blow in a year where the Celtics went from "they will be in the Eastern Conference Finals every year for the next five years at least" to "they're okay but have a lot of work to do." It's been a perfect storm of things gone wrong. How about next to Kristaps Porzingis in Dallas? The Mavericks are considered favorites to land Celtics free-agent big man Al Horford, according to league sources, and the two Los Angeles teams are said to also have interest, though they both have their sights set on bigger fish like Kawhi Leonard.