question about how to incrementally rebuild an image out of cluster

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The rbd diff-related commands compare points in time of a single
image. Since children are identical to their parent when they're cloned,
if I created a snapshot right after it was cloned, I could export
the diff between the used child and the parent. Something like:

rbd clone child parent at snap
rbd snap create child at base
<use child image>
rbd snap create child at changed
rbd export-diff child at changed --from-snap base child_changes.diff

the questions are:
1. Does the child at base really necessary? It seems point the same obj with parent at snap, why should'n I use the parent at snap instead?
2. If I create child at base, comparing with use child image directly, are there some performance redundant or storage increment when writing the child image later??
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