Numbers and speculations about Bloodstained's size

We are "not that far" away from Bloodstained locking up and ready for release (at least, we hope so). Considering that, it is starting to be the time for speculations. 
Reading comments around the internet about the game, IGA's past interviews, some pages and other things, i came up with some interesting speculations about Bloodstained's game size and i wanted to know the community's opinion about it. 

Here goes:

1600+ROOMS

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The only number we have, so far, about Bloodstained's size is a promised number of rooms, that was said to be "more than 1600" (or 1600+, for short). If that ends up being the case, the game will be lower than Symphony of the Night (1890) and, technically, it will not met the Stratch Goal "IGA's Biggest castle".
The dev team said once that Bloodstained was being planned to be "1.5 bigger than Symphony of the Night". That doesn't add up to the promised Bloodstained's castle size of 1600+ rooms, since that is lower than Symphony of the Night's size (if you count two castles) unless...

BLOODSTAINED CAN HAVE TWO CASTLES

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If that is the case and if the promised 1600+ rooms considers only one castle, then the game would be MUCH bigger than Symphony of the Night, reaching the whooping number of 3200+ rooms, something i really don't believe it will be the case. IGA said that when the team calculated 1600+ rooms for the game, he considered that it was "a bit too much" but wanted to do it. That was before the dev team changed and increased to make better use of Procedural Generation.
Procedural Generation is not only a tool to make games with random elements, but also a method of randomly creating scenarios using pre-made assets to make them look more interesting and varied and also to easily create huge scenarios much quicker. (You create the scenario using procedural generation, fix what it has to be fixed and them lock it). 
Using procedural generation, the game can be created much more easily and that also means a bigger game overall.
If Bloodstained doesn't end up having two castles, there is other thing that can be done to make it bigger, and that is...

PROMISED ROOM COUNT DOESN'T CONSIDER OUTSIDE / OTHER AREAS

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If the room count of 1600+ rooms doesn't consider areas such as The Village, Galleon Minerva and anything that is not strickly inside Gebel's Castle that may exist and we don't know yet, and only considers the Castle itself, then the game can easily reach beyong 1890 rooms of Symphony of the night and reach the promise of being 1.5 bigger than Symphony of the Night as a game.
If that is also not true, then the last speculation that can be done is...

BLOODSTAINED GAMEPLAY HAS ELEMENTS THAT MAKE IT LONGER / BIGGER

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If the game has elements on gameplay that make it longer, bigger or more time-consuming (such as several completionists elements, tons of backtracking and such) the game may not be bigger "physically speaking" but may take longer to finish and ends up being bigger due to that.


CLOSING COMMENTS

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Symphony of the Night, according to how long to beat website, can be finished in 9 hours (main story), 12 hours (main + extras) and 17 hours (completionists).

If "Bloodstained being 1.5 bigger than Symphony of the Night" promise ends up true, Bloodstained could end up with something like: 13 hours (main story), 18 hours (main + extras) and 25 hours (completionists).

IGA said in the past that when they were still aiming for the 500.000 on Kickstarter, the game was planned to have around 10 hours of normal gameplay (already a bit bigger than Symphony of the Night's normal gameplay) but as Kickstarter started to get more and more money, the planned for the game to be around 1.5 bigger than Symphony of the Night.

As said above, that doesn't add up, due to a simple math:

Bloodstained promised size: 1600+ rooms.
Symphony of the Night's size: 1890 rooms.
Bloodstained havnig 1600+ rooms and being 1.5 bigger than Symphony of the Night doesn't make any sense, unless one of the speculations above ends up being true or something else that i wasn't able to think about.

What do you think of all that?

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That's all folks!