I think I get it now, there is a lot to dig through in text.
Are you saying treating cuttings with mycorrhizae will help them root faster? Or help the roots grow faster once they start to form?
In that case, I would wonder how long those fungal propagules can survive in water without roots to infect, vs how long it takes a cutting to start forming roots. They're stored in a dry powder, I wonder if that's because they have a short shelf-life once you get them wet...
I've seen fuzzy stuff growing on my cuttings in water before, but they never rooted, I figure it was some sort of pathogen actually...