nominative absolute adjective construction(带逻辑主语的形容词独立结构)

We are less credulous than we used to be. In the nineteenth century, a novelist would bring his story to a conclusion by presenting his readers with a series of coincidences—most of them wildly improbable. (New Concept English, Book3, L. 36)

most of them 之后是否省略了 were? 这里没有谓语呀! 我查了《新概念英语》的所有辅导材料, 均未对此进行分析。