'I'm sure a CMH must be in the works.'
No, he got the Navy Cross. Maybe for the other Marine.
I believe he Navy Cross is a precursor to the MOH.
I checked out the Medal of Honor website and there's no straight answer:
http://www.cmohs.org/medal.htm
In the USSC I cannot find a section where on medal can prohibit another:
Sec. 3741. Medal of honor: award
The President may award, and present in the name of Congress, a
medal of honor of appropriate design, with ribbons and
appurtenances, to a person who while a member of the Army,
distinguished himself conspicuously by gallantry and intrepidity at
the risk of his life above and beyond the call of duty -
(1) while engaged in an action against an enemy of the United
States;
(2) while engaged in military operations involving conflict
with an opposing foreign force; or
(3) while serving with friendly foreign forces engaged in an
armed conflict against an opposing armed force in which the
United States is not a belligerent party.