Considering all but two Post-SotN titles have been "CASTLEVANIA: ___ of ___", it would indeed have made for another slot-machine title. I can just picture IGA in front of a title slot machine going,
"Castlevania...Castlevania...Darn it! Harmony of Sorrow!? Again!?!?"
(he puts another coin in)
"Castlevania...Castlevania...DAMN IT! Curse of the Moon!? I'm running out of long words to put together!"