I've been reading some earlier and current edition stuff.
The Eldritch Order of the Unblinking Eye cult in Eye for an Eye doesn't have a particular Ruinous Power noted as its devotion. It was busted up in Altdorf about 10 years ago, Lord von Bruner playing a role.
The wicked Van Horstmann, former Patriarch of Light, was revealed as a chaos cultist of Tzeentch by Vespasian Kant (who became and is current patriarch) and fled to create the Cabal (which did not exist until then), at an unspecified date.
Other edition materials note that "the unblinking withered eye" is a symbol of Tzeentch used by van Horstmann.
Does it work that the Eldritch Order of the Unblinking Eye was a Tzeentch cult to which Van Horstman belonged, that it being busted up was part of the events that unveiled him, that the "Unblinking Withered Eye" is his take on "version 2" of the original?
Is there any canon that this runs counter to?