I'm always interested when people say things like "important part of poly relationships" like poly relationships are fundamentally different from non-poly relationships. Consent is not inherent in poly relationships. What it is inherent in is healthy relationships, poly or not. Whether people in a relationships are poly or mono has no bearing on their ability to form healthy relationships. Both groups of people fuck it up as often as not.
Honestly, DADT means nothing to me because I'm not in a DADT relationship. I would hazard a guess that it means something slightly different to everyone who is in one. I would add that many of them don't self-identify as polyamorous and thus are unlikely to find themselves here to answer your questions.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker