...and Toc, of anyone, would recognize KC Matron neckskin, thus being able to make the joke/comment, even if redmask (and half the forum

) didn't get it.
There is without a doubt some huge question marks about RM, and we may, or may not, ever get the answers. I think it was clear the KC were never 'fooled', and in fact, the scene between Deadsmell, Twilight and Tavore re the Shake suggested the KC may have reason not to like the Matrons all that much
That leaves open the possibility that RM may have ingratiated himself to them by killing a Matron at some point before it could enslave the two who followed him, or even freeing them, so to speak.
If, in effect, the entire KC domination of the world, enslaving the Jaghut, subsequent war with the Tiste and matron-death-cry-ends-existance thing was all the Matrons' fault and not the KC lizards themselves, that certainly alters a number of things we had taken for granted. Throw in Silchas' negotiations with the KN and it's anyone's guess how the KC plot line will develop in the next three books.
And in that respect, the Tos/Redmask plot told us a LOT.
- Abyss, uses mighty thread fu to tie all that back into thread.