StormService not Rollout unscheduled pods firstly

Recently I use StormService in our production K8S, I found the Rollout pods rollback does not prioritize rolling back unscheduled pods, but rolls
back pods in sequence.

For example, I apply 6 replicas with nodeSelector app=aibrix, pod-0,3,4,5 is scheduled, 1 and 2 is not scheduled, because of only 4 GPU nodes with label app=aibrix are available.

Then I unset label of 2 nodes for other usage temporarily. When I rolleout 6 replicas to 4 replicas, StormService Controller will roll back pod-5 and pod-4, the unscheduled pod-1 and pod-2 is not deleted.

I expect the unscheduled pods can be delete firstly. I want to ask, delete the pods in order is how is the design, or delete the unscheduled pods firstly are taken into account in the future?