The word-initial metathesis is actually older than the word-medial one,
all Slavic dialects underwent that change and the isoglosses are different. ….
The distinction between long and short vowels was preserved in northern dialects:….

So I doubt if so called "redactions" of OCS actually happen much earlier, during migrations, under different language influences,  Late Common Slavic.

As for the Albanians, let us not expand this topic.

Do not worry: we met earlier plenty of "forum-scientists", I remember one with more than 2000 books in his library
Sotirović (Vilnius university) about Strumfakia, for patient readers who are ready to find that Albanian phonetic changes are more closer to Baltic than ancient Balkan languages.