In what ways is Pris Stratton a double of John Isodore?

John R. Isidore is one of the novel's supporting protagonists. He is a "chickenhead" who works a menial job. He represents the innate altruism of humanity. He attempts to befriend Pris Stratton and the Baty's and to protect them from the bounty hunters. His faith in humanity is shaken after the androids torture a spider and when Buster Friendly announces the Mercerism is a false religion. Like Isadore Priss has a menial job too. She must protect Baty and others from the bounty hunters. She is sacrificial and is altruistic in her own ways.