Earlier quoted context omitted.
>This sounds to have a Russian angle to me (e.g., the word 'vse') Proto-Slavic *vьśi ("all") would yield "vsi", not that far off. Many modern Slavic languages add additional suffixes: wszystcy, všichni, vsichki etc., which are secondary. Serbian comes close but they swapped the first two consonants: svi.
They did not just swap it, did they? Svi (everything) is also related to svit (the world), which is also in Russian as svet. This is why I say Serbian made more sense to me as a native Russian speaker. Likewise Serbian sutra, which in Russian is zavtra, same idea (in the morning, i.e. tomorrow) but with seemingly more unnecessary manipulations (considering morning is still utro in Russian).
I'm not sure what the argument is here. Can you elaborate?