I'd agree more or less. On one hand we may be underestimating them a lot. They are not just a lot bigger, they are apparently a lot stronger per pound, so it may not be as much effort for them to carry one of theirs as it would be for one of us to carry one of our own. There is likely a limit but it may be a lot farther than we assume based on what our limit might be. The other aspect is if there are burial areas they must be remote or obscure else we'd have found them already. Those are the same characteristics of core areas. Perhaps those older individuals who are less able to travel stay in the core areas more and wind up closer to where they'd be buried than the ones who travel far.
In a concrete sort of way, that gives me an idea regarding my own search / research. My locations may be right. Some I've identified but not gotten to may be more worthwhile than I thought. Soon as the snow melts in June or so I have work to do.
MIB