Until you finally admit the truth, which is that the seniors can be converted to commons if FHFA and Treasury agree to it.
Senior Preferred Stock cannot be converted to Common Stock or any class of Stock UNDER THE TERMS of THE AGREEMENT.
WRONG.
This post contains the proof. FHFA and Treasury can agree, at any time, to convert the seniors to commons. Amending the contract is specifically allowed by the very contract that you keep quoting!