Sci, read the link you cite completely before dismissing my point.
Acting officers
Acting officers may be eligible. In 2009, the Continuity of Government Commission, a private non-partisan think tank, reported,
The language in the current Presidential Succession Act is less clear than that of the 1886 Act with respect to Senate confirmation. The 1886 Act refers to "such officers as shall have been appointed by the advice and consent of the Senate to the office therein named..." The current act merely refers to "officers appointed, by and with the advice and consent of the Senate." Read literally, this means that the current act allows for acting secretaries to be in the line of succession as long as they are confirmed by the Senate for a post (even for example, the second or third in command within a department). It is not uncommon for a second in command to become acting secretary when the secretary leaves office. Though there is some dispute over this provision, the language clearly permits acting secretaries to be placed in the line of succession. (We have spoken to acting secretaries who told us they had been placed in the line of succession.)