Skoll Shorties

I think the undead are not affected by the influence of the Old God I’m not sure but I will look into it

They don't need to be under an Old God's influence the way that Yogg-saron could get to them is VIA Helya who clearly has an influence on them.

Yeah but what does she get out of this , also she made a deal with Sylvanas at the start of Legion so it might be connected in some what

She did earn her freedom from Odyn VIA working with Loken. That might've been enough.

Still I wouldn’t just discard that just yet we really don’t have enough information on what Sylvanas is hoping to achieve, still it’s interesting to see the Helia would be working with an Old God to obtain something from him like Azshara did with N’Zoth

It would explain her current form being very old god-ish.

Sure that have similar coloration but that not imply that it has a relation with Yoggan Saron it just the art team reusing old coponates of an older model and using it in a new one