Lets face it. Moody's, Fitch, etc. all rating agencies are not for the individual investor to give advice. It is a mistake to think so.
They are instruments of the American banking system with the task to give ratings about others in order to support the business of the american banks. They will closely follow the FED intents and purposes. That's all there is.
If their interest is to downgrade any bank in any country (despite obvious facts), they will do so. If their interest is to upgrade some banks, (despite obvious facts), they will do so.
Never invest according their advice. Complete your own due diligence.