One of the Smart moves by KC was after they Traded for Wade Davis, and saw he wasn't cutting it as a Starter for them, they moved him to the Pen.
Davis went from a 5.32 ERA starter for them, to a lights out 8th inning Set-up man, for Holland.
Starters that are FA's who might have the great arms, just not good, in the Starting role, is a good way to take a chance, on making your BP better, without spending big.
Gamble yes, but you never know till you try. That's why I like Gausman, a role like this.