My attempted solo Lena vs. Dark Force got me thinking...
Lena can equip things, such as the Royal Emel, that she would never be able to access normally. In fact, Sari can't access it either. So, that has me thinking...did they, due to space concerns, essentially make Lena/Sari, Lyle/Ryan, and Thea/Kara the same character, just with different stats and levelups? That would seem to make sense, because otherwise, it's really odd that Lena can equip those things (just as Rhys can equip the Nei Sword)