[HairOfTheDog]

I think it is quite plausible... And you are right, at least three of the Nazgul have an alibi for that night!

[cantbebought]

Getting a little ahead here but, we learn from Gandalf at the Council of Elrond that only 2 were seen at Bree til the night after the Hobbits left when at least five (??3 from Crickhollow plus the Bree 2??) came from the west, rode down the gate and pass like a howling wind.