(a) The court shall appoint the next eligible designated alternate guardian named in a declaration if the designated guardian does not qualify, is deceased, refuses to serve, resigns, or dies after being appointed guardian, or is otherwise unavailable to serve as guardian.
(b) The court shall appoint another person to serve as guardian as otherwise provided by this title if the designated guardian and all designated alternate guardians named in the declaration:
(1) do not qualify;
(2) are deceased;
(3) refuse to serve; or
(4) later die or resign.