I think the term "WV swirl" came into use in the days before we had sorted out some characteristics of the vintage marbles from different (WV) companies.
Once we became more and more able to ID certain types as "Cairo," "Alley," "Bogard," "Ravenswood," etc,, the term "WV swirl" remained useful (as it still does) only for those remaining swirls that can't be pinned down to any one company.
I don't think the term should be applied when we know the marble's maker, like Champion, D.A.S., etc. No point, really We don't need a "catch-all" for them - - -
JMO .
Don't know nuttin about no big WV swirls. Just big Alleys.