My suggestion is that the letter be signed by the person who understands what it says. Generally, when someone purports to speak for the bank, I would say the CEO should sign. However, in comments on regulatory issues, they occasionally call and ask questions or seek clarifications. This is particularly true in this case - they are not asking for comments, they are asking how these programs work. While I am certain Andy's CEO would know the answers,
I still think its best that the author/architect sign it.
These folks are no different than you and me, receiving two copies of the same letter is a bit of a nuisance.