I think your right on about the pictures. Oversized heads and small bodies too many fish not enough food. see same thing with bream and bass in over-populated ponds.
on the flip side. I fished **$#@ creek a few years ago maybe 3 now.. when doing research i was told would only find small fish there. I did find some smalls but was pleasantly surprized at the keeper sized specs and bows I caught. sometimes I think the generic approach is mis-used in the Smokies. just using stimulator flies and not really paying attention to what is correct food source for that time of year. Big fish didn't get that way being stupid. But I hear alot how dumb wild fish can be.. or oppurtunistic. not always true...