Preacher wrote on May 8^th, 2012 at 5:19pm:

I'll size-up if I want to exclude smaller fish

this explains my younger brothers theory pretty well. big fish can eat anything. smaller fish can only eat things up to a certain size. smaller things allow for more bites which allows for more knowledge on the color/speed/depth/etc of what the fish want. this knowledge then helps to produce larger fish in the long run

big fish dont get big by being overaggressive chasing meals. they are opportunistic. getting to the right spot/speed/depth at the right time matters much more than size in my opinion.