you can rewrite a slave fully regardless of the author being active or not (it's better to ensure that the author is OK with that, though), but what's the most important is to preserve the supported versions & the features.
Full rewrite doesn't mean that the old slave source isn't used. That's why even with a full rewrite, the new slave author "coauthors", retaining credit for previous slave writers (except for some very rare cases)
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