Roan was right in the end. With Rean and Havek's support formations and the many Transition Realms in the cities defending, the cities were able to stand their ground against the Jamai Sect disciples. Of course, that would only be for a limited amount of time, but that was all the time they needed until Roan's forces arrived.
By the time the disciples attacking Butiva used their Thoughts Transmission Talismans to contact the attacking forces, six of the eight armies and their disciples had been caught by the Butiva Country Alliance! And thanks to Rean and Havek's Thoughts Disrupting Formation, the captured disciples weren't able to warn the others before taking the Oath against their will.