The card is not exhausted by the target of the attack, so it's not a matter of "stacking" per say, as it exhausts each friendly ship that drops the damage. Can see it working either way... It works similar to BCC then.. a fighter can tap multiple BCC's from different ships. In the foresight article the mistake was a basic rule from the core game, not technically foresight (if you could use 2 evades, foresight would eliminate 4 dice).
The APT question is a good one, although I would think if they could shunt the APT damage, it's APT damage and would not be converted to a shield (as it's a direct face up card that ignores shields).. Now.. what about concussion missle damage?
Bright Hope could stack as well. Hard to do some damage to this ship, if you can reduce every single damage by one (i know, Bright hope has a different wording and two triggers and will only trigger once because of the "while defending"). But alone this idea was nice
Gallant Haven would suddenly be able to prevent each damage the squadron would suffer.
Same with Biggs. Suddenly you would be able to transfer as many damage to other escort squadrons as you want to.