Language About Language

According to Set Theory, the distinction between Universal and Particular is one of kind, i. e. Set vs. Member.  In contrast, the Venn Diagram representation of that difference is one of degree, i. e. more extensive vs. less extensive.  So, when Wittgenstein, in #121 of the Investigations, denies that Philosophical discourse about Language is "second-order", it does not follow that it must be 'first-order', like its object.  Rather, the Language-Game of Language-Games can be distinguished from other Language-Games as more comprehensive than any and all of them.  Likewise, Language can be about Language without being detached from it, as Russellian Logicism seems to insist.