On your point 1) I agree for the most part with how you have laid it out. That is probably a large part of the delay to multi-cavity, to attempt to get strong claims in the new patent applications.
The part you do not mention that does concern me, for whatever company might end up bringing this to market, is how much of the prior art is still under patent protection (and so subject to royalty or licensing payments as part of bring out the newer, extending the art, product ?
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