I'm sorry to say dear sir, but wowprogress lists them as world 13th ragnaros hc, world 9th sinestra and world 14th Nefarian hc. 'some random kr guild' should be changed to 'a top 15 guild that became top 5' in my opinion.
also, there is a gm on the killshot, and we know gm's have been monitoring hardmodes for weeks. I don't think they cheated, or blizz must have allowed them to do so.
GZ KIN raiders, nice to see a new contender for WF kills. Although Paragon seem to be very kind persons, a change was nice.