In a demo, colossus 9 is shown at the position of colossus 4. I've never seen gameplay from this demo or iso. In the same video, there is this table from the other image. It's an old video, currently it may be that everything has already been explained, but I'm out of the loop.
I remember seeing years ago that the colossus would bend down there for you to hang from its "mustaches", or was that always an element of the scenery?
I found this in a very old video, I don't know if there's anything about it. Apparently, the position/numbering of the excluded colossi was already well defined. I think the files are death animation, I don't know for sure, I just know that there are 16 files, one for each boss.
I found it here: https://youtu.be/mFifhYh0eio
Maybe it's already been explained, but I'm out of the loop.
I found here: https://nomads-sotc-blog.blogspot.com/2013/09/versions-builds.html?m=1
You can hear her voice, but I've never seen a translation of it. It even seems that Mono knew the price Wander would pay, a price that he didn't even want to know what it was. The link also has details of the planned alternate ending.
I found it here:
https://teamico.fandom.com/wiki/Shadow\_of\_the\_Colossus%27\_Alternate\_Ending
