Associations of Sky and Hayumi
From Sky
Pink - This covers the key interactions from Sky's perspective. Sky initially dismisses Hayumi's point against Ekko rather than engaging with Hayumi's read directly. Sky includes Hayumi in the Maybe yeet category before eventually voting Hayumi following Hayumi's VT claim. This vote feels more opportunistic as opposed to a developed read or an attempt to protect an ally. Sky's later interactions focus elsewhere (Atsumori, Melkor). The interactions are generally distant or negative. It's possible for this to be aligned, if we consider it through the lens that Sky (who we know to be scum) viewed Hayumi as an easy target post-claim and needed a diversion/something to portray as spew. This may be a stretch, but it's plausible enough that I would dissociate them for this stuff.
From Hayumi
Salmon - There's very little positive here, but what's present is compatible enough with non-alignment. Hayumi never warmed to Sky. Early posts show skepticism of Sky's meta-commentary. Sky is absent from Hayumi's town lists and eventually lands squarely in the scum pile. Hayumi's energy was directed towards other targets (Sparkles, Arne) and defending against wagons, culminating in the VT claim. There's no hint of protection or positive framing for Sky. It's all very consistently negative or dismissive, all while being generally unexplained from the perspective of alignment, and I would lean towards dissociating based on this side.
Conclusion
I have little reason to believe they are aligned from an associations standpoint, particularly given Hayumi's consistent negativity.