For Callaway, it would be a return to the position he held with the Indians from 2013-2017, before he was named the Mets manager prior to the start of the 2018 season.
While he may have had his shortcomings as a manager, there's no doubt to what Callaway brings to the table as a pitching coach. The Indians transformed their rotation into one of the best in baseball in his time in Cleveland.
Callaway certainly helped in the development of Corey Kluber, who won two Cy Young Awards under his tutelage. In 2016 -- Callaway's final season with the team -- it was undoubtedly their pitching staff which drove the Indians to the AL pennant. The team's OPS+ was 96, meaning it was actually four percent below league average. But their ERA+ was 118, meaning it was 18 percent above league average. The following season, the disparity was even greater, 104 to 138.
That year, their top three pitchers (Kluber, Trevor Bauer and Carlos Carrasco) went a combined 53-19. The Indians also led the American League in strikeouts in four of the five years Callaway was their pitching coach. As Mets manager, he saw Jacob deGrom win a Cy Young in 2018, and the right-hander is likely to win it again this season.
The Angels pitching staff is undoubtedly a work in progress, as not one pitcher made more than 18 starts in 2019. Assuming Callaway ends up in their dugout, he'll hope to work some of the magic he's provided a litany of pitchers through his coaching career.