But it makes the most sense for him to be the "mortal" version of Eros. Considering the instrument he plays is the tie of Eros's skirt drape. The names as well. And when he heard of princess psyche coming why hide?
But then again, your point.
If I look at it from a different perspective, especially, since from this chapter. There's a high chance he's not Eros. Because, if Eros wanted him to see his mortal version, why would he dress up as Ros at all?

Ok so. ML is CrayCray. I don't know if he knows about ros, or how he's gonna react about ros. But he's obsessed obsessed.