Could there be more than one mutation going under the name "sable"? I've not followed that project very close, do they all trace back to one sable founder or were there several imports with the same look that got the same name? People complain about different names for different lines that may eventually be accepted as the same thing (i.e. lesser and butter) but I think it's way more confusing to have two different mutations with the same name (i.e. woma).

Different mutations could explain the perception that adding an extra mutation would revive an otherwise fatal mutation combo. Suppose there is some slight chance that another mutation would counteract whatever changes make a combo fatal but it seems very very unlikely.