well the delay is a sign that IGA is serious to surpass SOTN (which is already surpassed by several of the later IGAvanias. and even a unorthodox game like Legacy of Darkness completely surpasses IGAvanias in lots of revolutionary ways). though no matter what they do, SOTN conservatives wont acknowledge ROTN being superior.
anyways, this delay really is sneaky, because thats gonna pressure more people to purchase COTM in the meantime.
though I still say Miriam is the TRUE protagonist of COTM. Zangetsu is marketed as the main, but COTM Zangetsu side can be interpreted as a nightmare of Miriam's, while Nightmare mode is the true reality of that spinoff dimension. Miriam is the fact of Bloodstained, so it makes sense that Miriam is the lead protagonist in COTM too, just as Ashe in Final Fantasy XII is the true lead protagonist, not Vaan, no matter how much SE pushes Vaan in Dissidia and other promotions.
though yea its up to interpretation! I say COTM is just as much the stories of each of the characters, rather than one character.
and anyways , with all the character switching mechanics, the player really is more of an observer. so there are various ways to look at COTM, whose protagonist is really up to the player and the player can manipulate the game to change the protagonist.