SM should first give a nice image describing the contents of the album, instead of only a text description. They have 2 different versions and I still don't know which to get because I'm not sure about the contents.
Wendy is more will known as a singer by the public then seulgi and Irene so possibly she will rank better but I don't think she's had any significant hits so I don't think she will chart that much better unless it's a really good song
Isn't Irene and Seulgi2 most popular idols in RV? I don't think Wendy will do better, but lets see. Wendy have had pretty long hiatus, so it is pretty hard to say.