Well, the fiction certainly seemed to imply that Surehand and Ehran were aware of it, and Frosty said in the main article that she'd been getting 'flashes' or some such, and had discussed it with Arete. So they know something's up, they just don't know what. Just like how they apparently know that Aina isn't really dead. And if Surehand and Ehran are aware of the link, then I'd bet my last nuyen that Harlequin is aware. He might be too blinded by passion to understand what it means, but he's aware.