If Cyan is supposed to be available on your phone, you will not downgrade, NSR tool will provide you the latest official release (Cyan). I am actually holding back in using the NSR tool, because if I do that, I will lose live folders. I know I can bring live folders back by enrolling in dev preview again, but what if the problem in Bitlocker is still not solved by that time? I don't want to use the NSR tool again for Denim. So here I am, waiting for either the fix or for the official Denim update.