Its just for the sake of comparing. And yes, there will be more moves to come. Point is, the pitching is comparatively weaker at this point.
Before last season started folks here thought the bullpen was strong, and "starting 3 are solid AF, #4 could easily return to his #2-3 form and #5 is a wildcard"
If one of the top 4 SP is lost for a length of time, now we have Kikuchi as #4 and White as #5, instead of Kikuchi #4 and Stripling #5.