How'd I miss that post?
Anyway, RKS said that it shouldn't be possible to absorb a Valkyrie's Taint, unless it is the ability of a variant of the Taint.
(Though, she also says this can change if the Lunar Tierce Knights want it to change, so...)
Because you were busy with other things. Anyways, RKS's explanation makes sense and I'll accept it.