Blacephalon traditionally runs scarf though and thus HTyphlosion, which i see running specs mostly, would fulfill a different role. Here is how i see it: scarf blacephalon is a speed control tool/late game cleaner while specs HTyphlosion is a wallbreaker that also spreads status and thus is difficult to switch into with standard ghost checks (spdef landoT, tyranitar, weavile all hate taking burns and the risk would deter then from coming in easily). It's more wallbreaking+utility in its own right and would fit snuggly on ghost spam teams with specs hex dragapult.
Salamence fans stay winning.