[Text] word starting [q] must have a valid counterpart word starting [o]

[davidjackson]

Take "qu" in English. It's usually a bigraph but you also get "q" without u in loans. There's a wiki about it You are not allowed to view links. Register or Login to view..

Which I said earlier. 
Of course, let's not get hung up on a direct correspondence : q ain't necessarily q. 
But if q+o Appears in  say, 90% of cases it's an indication that something is going on. If Voynich ese glyphs are letters, then we have a bigraph. If they aren't, we still have a syllable.
Hey, this dates from the 15th century  You think they knew about loan words then?