I just got to this post now (been extra busy lately).
Maybe I can throw some perspective on the whole crown issue. The following are, to an extent, my own theories and intuitions.
First, we all have operative crown chakras -- we would be dead without them. Whenever we say a chakra is 'awakening' that means that the activity in it is currently noticeably increasing. 'Awakening' is really a relative term, not an absolute one.
We subjectively accommodate to the steady-state and no longer notice it. If your crown is in steady-state (hasn't significantly changed in level of activity for some time), you'll notice nothing there. That's true no matter what stage of 'development' you are at. If Buddha's crown is in steady-state activity, he notices nothing there....
So a sensation in the crown can mean it is 'awakening'. It doesn't mean that it is 'awakened'. A person with a more 'silent' crown may actually have a more developed system than a person with a crown that has become noisy. (By silent here I just mean not 'presenting' or drawing attention to itself, not 'silent' as in 'inner silence'). In short:
Steady-state hardly active = silent
Steady-state moderately active = silent
...
Steady-state highly active = silent
In transition = noisy
The warnings on 'crown awakening' as I understand them, are warnings against practices attempting to physically 'direct energy into the crown'. Apparently, people have had major problems stemming from such practices. I have no personal clue about these, but I believe these risks.
I saw this as a warning against those kinds of practices. I didn't see them as a warning against the crown spontaneously awakening, or even against things which may kind of indirectly awaken your crown, if it is ready. If that is a non-AYP position, let me know, someone. Yogani?
Any kind of anhanced activity I felt for a while in my crown was never the result of any attempt to 'move' energy into it. The process was a little different; a better way of looking at things (with more unity) would spontaneously arise, or would be stimulated by some other source (such as by a teacher like Nisagardatta). As I started to look at things that way, some crown 'activity' would follow. This was typically very peaceful for me. There was a great sense of completeness and deep rest. It was joyful, but not exciting. And it is in a good way, that I mean 'not exciting'.