I'm of a similar oppinion although I don't even think that they need to be outwardlly grumpy to do so. Cells will be taken down if for any reason they doubt them but if they can't gain access to them they'll just sit back and wait until the resultant queen goes missing on an alledged mating flight.
I'm also dubious as to whether the majority of cell protectors are actually beneficial. Another of my wild theories, but I'm fairly sure that it's better for the bees to have direct access to the cell -you can always tell a good 'ne if you look back a few minutes after introduction; the recipients will be all over it, in a friendly way. What if they pull an unprotected cell down? I've come to the conclusion that it's for the best and simply saves time in the long run.
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