I agree about switching patterns and still catching tons of fish, wasn't the point of my question/theory, I've been going to Bennett for 24 years now, and still my park of choice since its been my family destination so often, and never thought any different until several years ago when I started exploring many more parks and wild streams, I see fish all the time swim out of the deeper holes down there and eat guts, then return back to thier normal feed lanes, and guts are full of protein, so a fish can get most of his daily intake off a gut pile versus slurping dozens of nymphs or fly’s. Take a lunker into consideration, a lunker fish on average is going to go for a egg pattern, worm, sculpin, leech, minnow versus going after something that is going to take a lot of energy but not gain a lot of food to fill him up. The lazier they can be the better, however if the see a injured minnow, huge gut pile, they will use the energy on that one meal because they know they'll be filled up for a while, so imagine when a smaller fish takes a big meal, they may not eat again all day.
I think alot of it is the "daily stockers" however if you go to RR you have the same "daily stockers" and yet you can take someone like my wife, or a kid, or a newbie, down there who chooses to fish toward mid-day, and they'll catch fish, put them at Bennett and they will struggle without having someone constantly coaching them on what to change too, and how to switch your drift, depth, etc. However they are completely different rivers too, whereas Bennett is way more action packed in the first couple hours, whereas at RR I have my best fishing an hour or 2 after the buzzer and late morning, so they can't be 100% compared to each other, which is why I share my time between both rivers several times a month.
In the end I'm not really bringing this up to "improve the fishing in the mid-day" Usually when I go down there I just fish till noon and go have lunch anyway, then go back dink around in the heat of the day catching them using cracklebacks/dries/buggers and then really fish hard in the late afternoon/evening. However I just am thinking out loud a bit, and was hoping they'd get a cleaning station put in some day, so A) the river stay's clean I don't get yelled at for cleaning fish in the hotel room