Jeff I think you are following along well. Thanks for joining in.
If we don't stretch out and seek the answer we never improve our knowledge. The only difference is I started on this learning curve a few years earlier than you. Its about the journey.
Jeff,
To some extent..yes. The primary reason for thinning intermediates is due to resource availability. Removing mouths so that existing mouths have more to eat.
That is a prime way to manage the bioenergetics of energy flow to the fish i.e. ; the same amount of total energy is allocated to growth, reproduction, foraging , and basal metabolism but among fewer users = more growth and less stress to the fish's other functions (better efficiency).