User blog comment:SomeoneYouUsedToKnow/SYUTK's V5E4 - OHANA - Impressions/Recap/@comment-26018514-20171109010240/@comment-26018514-20171109232224

it's a pretty safe bet Qrow assisted Ruby in the creation of CR if he is the only scythe weilder around though, and if they create them in school, that's a class you probably take once and don't go to as a regular class schedule class... and If Qrow really is as much of a field operative that Ozpin relies on all the time, he probably was not a regular teacher with a normal workload.