Well, they need longer starts and bigger leads too. But yeah, if they're not going to get them (and the state of the rotation and line-up suggests they won't) that needs to be accounted for.
And you're right, what was the point of replacing Marte with Moore (and potentially losing Ortiz) if he wasn't gonna pitch?
A Seranthony demotion/rest would just mean a lot of painful Soto/Kimbrel innings, so let's hope managing his usage more is the answer before that.