I also believe Hazza is the favorite. Hamdan is already the Governor of Al Dhafrah, I don't believe he would get a "promotion" at this point in his career. Mansour as Vice President does not need this position, I agree with you. Regarding Tahnoun, I believe that the duties of this position do not match Tahnoun's personality, and he already has too many powers and responsibilities. Regarding Abdullah, I disagree with you, I believe he has the ideal profile to perform the duties of this position.
And if we stop to think, Bani Fatima already has a President, a Vice President, two Deputy Rulers and a Representative in Al Dhafrah. Only Abdullah was not presented with a position of this nature, I do not doubt that this position was reserved for him.
My main names are Hazza and Abdullah