Didn't I hear a Lori quote from the AGM where she said when asked about the drill program "we're half done"?
I know some were confused that she chose those words and would not commit to a number of metres drilled.
It's possible at that time she may already have been planning the extra 10,000 metres recently announced. Her statement could have meant that 10,000 m (or the initial drill program) was done and the next 10,000 was just beginning.
Could answer the question as to why Sculpin's timeframe is skewed.