I am quite worried that I will be rejected. ECAS shows DM on last Friday but no AIP or DM letter received yet. I was required to submit proof of relationship&police certificate. The only letter I got is the SA letter and the status changed to DM without a AIP.
They will typically send a "Procedural Fairness" letter before they refuse an application, to give you one last chance to submit what they have asked for or expect. They will typically give another 30 days to get those proofs.
There is a scenario where you can actually go from SA -> DM. If your security check is finished, and your medical still valid when they assess your file for membership in the Family Class. It's possible for them to just decide, once they had the relationship proofs.
That said, We got a DM in ECAS, and within 2 hours a landing invitation from Kitchener. I didn't get a DM letter until 2 days before we were to land...