THIS POST CONTAINS SPOILERS
Yes, I thought of Lydia after posting. She seems to have 9 lives though!
I loved the confrontation between Hank and Walter in episode 9! I will definitely be viewing that again before next week's episode.
Yep, could happen. It has been noticed though that Walter takes on some traits of the people he has killed, like cutting the crusts off his sandwiches (Crazy 8). He's also driving a Volvo (Gus Fring) in the flash forward scene at the start of season 5 and having his drink on the rocks (Mike) instead of neat. Again, in the flash forward scene at the start of season 5, Walter tears his bacon up and arranges into his age just like Skyler did in the pilot episode. He's also using her maiden name in that scene.