1 and 5 are very relevant
You are not suggesting that an aircraft can land with another aircraft taking an early turnoff maybe half way down the runway before it clears ?
Yes he is! I don't know what it's called nowadays but it used to be called a "land after" which may (in the UK, and other places) be issued if certain conditions exist.
Would I land after an aircraft I can see halfway down the the runway, while he was still vacating? Yes, if I knew I could stop before running into him, and if so cleared to do.