Kingsley urged Hermione weeks earlier not to make any rash decisions about Rodolphus until she learned about his plans. Was that his way of saying that at least in that instance he felt that Rodolphus was better for his survival than Antonin? She was unsure of everything. While she knew that Rodolphus was open with her about his plans, she wasn't foolish enough to believe that he told her everything. That was complete madness. He would never let anyone get close enough to know all of his secrets. How did Kingsley factor in to all of the parts of Rodolphus" plans that she didn't know?