Frankly speaking , there are couple of logic flaws in the scenario and the probably main character, Sarah is so tenuous compared to her sisters. In this season, I've got stronger feelings that her role to promote the development of the plot has already completed. The scriptwriters were struggling to make Sarah helpful to clone club in some ways. Nonetheless, Sarah might be a spiritual leader, a symbol of free will for all the comrades who are dedicated to manumit all human experimental subjects from the oppression of capital.
Also, I feel sorry for the sacrifice of Susan. Those poorly-educated folks could never understand her strong sense of ethic of science and how much she was devoted to the wellbeing of Lida sisters. If she had been the ultimate villain, clones would basically have had no points to strive fiercely.
As a student majored in life sciences, I give this series 5 stars anyway.