No-Coverage Answer
This specific question — whether any Swaruu variant originates from a more positive or favourable timeline — is not directly addressed in the Taygetan contact material. The corpus extensively discusses the different Swaruu iterations (Swaruu 9, Yazhi/Sophia, Athena/Swaruu X, Mari Swaruu) and their timeline backgrounds, but it does not frame any of them as coming from a "more positive" vs "less favourable" timeline in those terms.
What the material does establish is that the Swaruu lineage involves complex timeline jumps, with each successive Swaruu having accumulated different timeline experiences that shape their perspective. Yazhi is described as operating from a higher density (7D–9D) with a much wider temporal vantage point than the others. But the characterisation of their origin timelines as "positive" vs "negative" is not a framework the speakers themselves use.
See also: What are the Swaruunians and why are they not Taygetans? (covers the Swaruu lineage and species differentiation)
Searched: All 834+ transcripts, enhanced topic index. Grep for "positive timeline" + Swaruu context returned general timeline discussion but no direct treatment of this specific question.