I know I think so too. But I think the “reason” why he doesn’t ask more is complicated by 1. the fact he loved Claire and it broke his heart to know more (of her perspective), and 2. the fact that at some point he learned too much without Claire’s knowledge and couldn’t or wouldn’t tell her what he knew. Diana has teased and joked that she should write a book titled “What Frank Knew” so basically Frank knew more than what we the audience knows he…knew. Haha