Anyhow Silent Salt Cookie did not appear but there was some interesting stuff that might tie back to him (yes, might. It's not a lot but I'm insane enough for it). Here's some speculation about him, his costume story, Nether Queen Cookie and the river of oblivion.
We know Nether Queen Cookie is searching for a successor, as she wants to retire. We also know White Lily is a candidate, so eventually she may or may not become herself queen of the nether realm.
As you know, in the costume story (wich are often alternate universes) Silent Salt is the one who guides Cookies across the river of oblivion, wich also happen to look quite different (Black waters and white flames versus clear pastel colors and flowers floating on the surface). He so happens to have a gaping hole in his chest (in the place of his souljam), and according to dialogue was however once a mortal.
I'd wager that the flowers for the eternal farewell costume set takes place in a alternate universe where Nether Queen Cookie chooses Silent Salt Cookie as her successor after his death, or at least employs (?) him somewhat. Depending on how episode 8 ends, (wether White Lily leaves or stays in the Nether Realm), this scenario could possibly fit in the main timeline as well.
On an unrelated side note to pin on my Silent Salt insanity page, I saw this piece of dialogue in the new story, and I might have a guess or two as to what this might be about...