Well, it's been implied at the very least, and I'd like to see if that is true, if perhaps she's been "barred" from the Spirit World for what she's used her abilities for and so has never been able to have a manifested spirit-a two-way communication.
So that could be the case, although I'm not entirely sure about the fusion. It sounds a bit out of left field, I mean, as much as Yuusei x Aki has gotten canonical support, it's always fragmented and just shoved in when there's a space and never at very regular intervals, so it comes out looking kind of forced. Aki's limited role in the storyline after season 2 probably contributed a lot to that, but still...
Not to mention that angel!Shooting Star looks an awful lot like Savior Star...with more wings. Anime might pull a fourth OP and show a monster that doesn't look much like what eventually came out in the anime (or at least, I didn't think the Shoooting Star in the OP and the Shooting Star in the anime looked alike, at least in head shape and coloring, I'l have to look again), but still, the current form they give doesn't contribute much to a fusion between Black Rose and Stardust, or making it look like a dragon upgrade for Aki. So I'm a little doubtful on that part.
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So that could be the case, although I'm not entirely sure about the fusion. It sounds a bit out of left field, I mean, as much as Yuusei x Aki has gotten canonical support, it's always fragmented and just shoved in when there's a space and never at very regular intervals, so it comes out looking kind of forced. Aki's limited role in the storyline after season 2 probably contributed a lot to that, but still...
Not to mention that angel!Shooting Star looks an awful lot like Savior Star...with more wings. Anime might pull a fourth OP and show a monster that doesn't look much like what eventually came out in the anime (or at least, I didn't think the Shoooting Star in the OP and the Shooting Star in the anime looked alike, at least in head shape and coloring, I'l have to look again), but still, the current form they give doesn't contribute much to a fusion between Black Rose and Stardust, or making it look like a dragon upgrade for Aki. So I'm a little doubtful on that part.