Oh boy, knowing FFXIV like I do, the aether sensing....uh. Let's just say, to Ruto's viewpoint, Sync probably senses a hell of a lot like a mini primal. He's made up entirely of energy particles (sound fonons to be specific) that are mimicking the human form. Oddly, though they're sound fonons, he seems to be wind aligned. He's also quite strong with his elemental abilities.

I am totally okay with Ruto getting Echo'd off Sync, though I'll apologise in advance because his backstory is not pretty.