Lana was meant to die to. But Clark changed that. If it was Chloe who was going to die he would have saved Chloe, any way he couldn;t have saved JOnathon because of his heart condition, it was something Clark couldn;t save. Im not sure why you were talking about Saving Lana when this is about Chloe being in Lana's shoes and being the one who was in danger not Lana