In some TWAB Bungie said that if after the Whisper of the Worm buff it won't be used either - they'll think about moving it to a special slot, it seems to me that time has come. In the special slot it will be able to compete for Izanagi, now it can't.
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It’s unfortunate that whisper lives in a world of fast dps phases. it has every other option beat out in total dps but phases never last that long. its like a minute to empty the entire mag+reserves. Even if they put it in the special slot it still wont be good.