Well, to be fair, you kicked off the tangent by wondering if Eclipse Magus could be from another dimension and if that had any ties to how Kid obtained the Astral Amulet

. Which led to talk about the difference between the amulet and Schala's pendant, because it was fair game.
And what we've ascertained is that the Amulet =/= Schala's Pendant, and that Lucca did not create the Amulet as the Compendium holds but Kid found it sometime around the orphanage burning, which begs the question -
how did Kid survive the original burning of the orphanage since Serge wasn't there to save her? Which relates to your earlier question by further elaborating it - could Amnesiac Magus have saved her?
So I don't think it was
that much of a tangent after all. It would certainly be fitting for Amnesiac Magus to somehow give Kid back the Amulet that Schala originally gave him (if they are in fact the same artifact). But I think that it fits so well into Belthasar's plan that he was probably behind it. But then again, he no doubt knew about Eclipse Magus...ah - this is getting nowhere fast.