Hi glaxony...I'm not sure I have answers for you and I'm not a BR expert...but I've thought of this resistance thing for a while, and what seems to me is that resistance could be built either way...in starting and stopping, or in continual use. I don't know if it does happen, but seems like it could.
Maybe there's even less chance of resistance woth start/stop....wouldn't they adjust to it more if continual?... because it certainly doesn't wipe them all out at once, so some, and, I think many, are getting exposed to the same thing for a while. Seems this would cause resistance too.
I know with other herbs I've taken, it will work a couple times, then nothing....they somehow learn how to avoid it. So, this isn't really resistance yet, but if I keep taking it, over and over...nothing happens, and I've wondered if continueing to take herbs 'waiting' to see some good results, or at least feel they've been fully effective....I wonder if resistance can build this way too.
As far as I can tell so far, I guess all we can do is take the herbs and rotate, and hope for no resistance, but I don't know. These vermits are so hardy. I have to keep starting and stopping herbs too, sometimes it works, sometimes not...lately I'm having very little success. I think just keep at them...I don't think you've done harm in doing rounds.