Small sample size caveats apply, of course, but since firing their hitting coaches and replacing them with George Brett the Royals have actually scored fewer runs.
Kansas City scored 4.0 runs per game and hit .261 with a .689 OPS in 50 games before firing hitting coach Jack Maloof. And in 23 games since Brett took over the Royals have scored 3.7 runs per game and hit .247 with a .658 OPS.
None of which has stopped the Royals from praising the job Brett has done, as manager Ned Yost told Terez Paylor of the Kansas City Star:
I think it’s gone great. I think Georgie has done a great job, I think him and [assistant hitting coach] Pedro [Grifol] both have done a great job. They’re tireless workers, they’re on top of everything, I think we’re making great progress in a lot of areas.
Imagine what Yost would be saying if the hitters had actually shown improvement under Brett.