Everything is up for grabs now. That Shadow may be one of the contestants.
Like the Joint Strike Fighter, all designs are off the table for the contest---just like the IBCT where the Stryker won.
Problem with these "joint contests" is that the USMC breaks away and develops its own designs after the contest anyway because the joint design may suit the Army but still doesn't satisfy all the USMC requirements and there really is no room for compromise. I mean, sometimes there really IS a reason why there is a USMC and an Army design and a compromise design just costs more money in the long run as the two services go their own separate ways (again!).
Why, the LAV-25 was a joint Army/USMC program (RDF for the Army) but the Army dropped out of it in the Cold War 1980s, thinking that the LAV was too LAV for the Army. But the LAV sure would've filled a gap between the M2 and M113/Humvee. The Army got the Stryker oooooh...20 years later with its 14.5mm AP armored skin, but to get a 25mm cannon, one still needs the M2 Bradley.
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. So sometimes "joint" works and sometimes "joint" doesn't.