Hey Dave,
As you, and many others on here probably know, the redbreast is one of my favorite fish in the Juniata and Susky. I just love the pugnacious little buggers and find so much joy targeting them every year. I had, and still have, concerns regarding how the burgeoning flathead populations was going to affect the redbreasts but it sounds like you are seeing no such decrease in their numbers (at least not a perceptible decrease just through on the river observations.) I know, deeper scientific investigation may reveal some stuff we can't with just being on the water and observing, but I really hope the flatheads don't start making the redbreast population drop.