1. I'm not entirely sure what would've happened to Neil should Mr. Keating not come into his life. It's possible he would still have committed suicide out of depression. plenty of things like that happen. Even if he didn't, Neil would most likely be miserable for a large portion of his life due to his over-bearing parents. One question I have though is (if you want to answer it, please do. I'd love to hear your thoughts) What would happen If Neil graduated? would his parents still force him to be a doctor even if Neil had no intention of being one? what would happen if after graduation, Neil decided to act anyway and this time his parents couldn't get in the way?

2. Bravest of the Keating boys? that's hard to define. there's a very thin line between bravery and stupidity (as Charlie demonstrated excellently). Todd was another good choice, as he was the first to start to outright call out the principle at the end of the movie. Now who was the coward? What was the name of the one kid who sold everyone else out? He did that and through Keating under the bus to save his own skin, not because it was the right thing to do.

3. The Poetry book made it into Neil's room probably because Neil brought it there and read it when he was really down. That would be my guess.