Huh? Back in the day, Night Thrasher and Nova had solos and Namorita was also co-starring in Namor. Justice had a mini-series too. How is that any different to four of the current fourteen Champions having solos? In fact, it was more of an issue in Waid's run, as of the original six member Champions team, only Viv Vision didn't have another book. Zub's expansion means that there's plenty of other characters who can be developed... chiefly his own creation Snowguard and Sam Alexander, whose solo was cancelled before Zub took over Champions, as well as Viv.