User blog comment:Zathronas/Analysis by an author: Peter Port/@comment-85.86.196.201-20131214223714/@comment-24218038-20131215011006

The thing is we know Ozpin knew about Ruby before he met her. Qrow and him have been in contact. You don't think Qrow would have mentionned his niece who he trained to use a scythe. Which seems exceptional by the way. It is clear Ozpin hasn't told everything to Ruby. The comment about silver eyes is only one example of this. Now the reason I think Glynda was here for Ruby is two fold, first Ozpin has been keeping an eye on he, second her sister was coming to Beacon and i'm pretty sure they wanted Ruby at the same time.

We know by the narration at the start that Ozpin is at least partially aware of what's coming and seem to think a simple soul is the solution to their problem