that was the exact same case of having a fixed composition. once you have a legit special duo with scarface and cordelia, there is no room for valerya to join in. some thought it was impossible. others thought valerya could replace any of those. you think it is impossible for a rudra to join the 2 yadu + 1 asura haris. well, it is not impossible. the solved rules shows that those who thought it was not impossible for valerya to join a fixed composition duo (by replacing any member, not by extending to a larger fireteam) were right.