You don't need to be a "scammer" to make a drastic business' change in direction. As far as I can see, Richard D hasn't said a word of a merger, whether yes or no, he hasn't said a word of how INCB is going to go around once all filings are done, if ever done..... etc., etc...
If something goes awry here don't blame him, blame those who have been pushing the stock, IMO.