just thought I'd mention, I've played the game recently and it says in chapter 2 that; " One week later, the next master arrived" meaning he wasn't living there until a week after the death of his brother
well then, that means he would've been even easier to reach, if they know who the deed is going to go for and he wasn't in the hotel at the time. granted this isn't very useful to consider, because by this logic pretty much any master could have been tampered with.
