I'm not sure it's plagiarism, but it sure looks like the Flikr photographer is copying Hido's work pretty closely. As someone mentioned the Picasso quote about good artists are copying and great artists are stealing (and I think this quote may not be from Picasso but I digress); when a great artist steals he or she steals from far more than one source. If you only copy (or steal) one artist or photographer, your work will be simply be reductive, and that's what the Flikr work is, but steal from ten or twelve sources... well, now that's another story! Maybe this Flikr photographer will find some other influences and move on with a more unique voice or the work will just look like Hido wannabe's.