I dunno where this thing of Sabi saying she thinks it's "most likely" Smash related comes from. She, me and those who have contact with the person who gives us such hints once in a lifetime, we have no idea what is referencing to or what game is about. It's as simple as that, we have no clue. People on multiple sites are thinking either geno, resident evil rep, devil jin from tekken, edelgard, etc, as usual the community just tries to come up with ideas of what it could be about, if it's smash, but really there is nothing else aside from the picture itself, we just dont have any other clue lol. There is no confirmation whatsoever or a "most likely" chances of it being smash either, at this point it could be anything.
As far as the bird type thing goes, we only heard (from the person who shares the hints with us) that if they wanted to hint edelgard they would have used a black eagle in the picture for a hint about her, YET THIS DOES NOT MEAN that the type of bird really matters in the end for THIS hint. The hint could be still a word play, like the "star" part or whatever, WHO KNOWS. There is no solid indicative of what the actual hint in the picture is, if the type of bird, the colors, the size, the roof, a combination of those, the actual name of the bird, nothing, we just dont know lol.