At lest all of you all have seen him & maybe fought him, I've been playing since November 2013 & ant seen him once (he apeared once but no one shouted the location out in the shroud so he was long dead before I found out were he was... got to see 50+ ppl mount running away thou)

Granted I'm a casual solo'er with no "Big-Time"/coil/EX-primal in-game allies (or any allies really gota use Duty Finder for every dungeon, hence why I mostly ignore coil/EX-primals) that plays during the day by west coast Canada times like 7am-4pm at average (less time if I work, odder if I had a few consecutive days off) so my chances are even slimer since I hear he likes to spawn late at night by my time.