What are you talking about? Windy never possessed two True Runes, only her half Gate Rune.
Unless there's something I clearly forget about.
And the Fog Ship Guide is not confirmed a Sindar or anything, my guess is he/it comes from where the creatures that are summoned during the use of the Pale Gate rune.
That's just a guess, not a fact.
And the Guide had no two True Runes only the Soul Eater for the time Ted was in there, I think he/it talked about getting the Punishment Rune and perhaps he had a host for it.
”I am ye who walks his own path and thus I walk alone”