Simon ben Gioras' control of Jerusalem rendered Eleazar and John's alliance useless and the Zealots split from John and barricaded themselves in the Temple. Just as Ananus' forces had surrounded him, in 69 CE. Eleazar found himself in a similar situation of helplessness.
Simon ben Gioras' control over Jerusalem rendered Eleazar and John's alliance useless, causing the Zealots to split from John and take refuge within the Temple.  As Ananus' forces surrounded both John and Eleazar, they found themselves in a similar state of helplessness.