I was surprised the Kurdi photo did not show up in the WPP also, however, I do have a theory that is not based on any data to support just a gut feeling. I have noticed on a few occasions in recent years that news photos that, to use the modern term, "go viral" on the internet rarely win major photo contests or place poorly. I am not sure why but as cold and clinical as this may sound in this particular case, I think it may have to do with the photo losing its effect. No matter how dramatic or heart breaking the photo may be, if you see it over and over again hour after hour, day after day as in this case the mind slowly becomes numb to it.
In the past before the internet there is no question the photo would have appeared on front pages of papers and in major magazines and maybe even on TV news networks. (though in pre internet days TV usually used stills in background of the news reader and not full screen) The photo would then have faded soon after and probably only been used small as a filer buried inside the publication on followup stories. Move to the present and for days even weeks every time I went online the photo was front on centre on news websites and full screen on the TV news daily...the photo was literally everywhere, one could not surf the internet anywhere and not see it in some form or another at least a couple times an hour for days or weeks afterward and as I mentioned earlier it gets to point where you don't really see the photo's heartbreaking content any longer.
I think a case could be made also for Richard Lam's beautiful image of the couple kissing during the Stanley Cup riots which went "viral" also and I was convinced that photo would deservedly clean up in the major photo contests....I don't believe or remember it won much if anything but I could be wrong. There was a couple other photos but they don't come to mind at this writing...I should have marked it down when I noticed.
I could well be way out in left field with this theory. This is only something that I noticed and haven't looked at in any detail and only reminded me when I saw earlier posts.