"Twin Destinies" reminds me of SG1 episode "48 hours"
When the Teal was lost after wormhole instabilities and the Wormhole shut down before Teal came out.
Sam use the DHD and some information from a NID 's Goa'uld prisoner to restart the gate and allow Teal to rematerialise.
What if the 1st Destiny crew 's pattern are still save in the gate's crystal buffer?
SGC just stop using the gate and check it.
Or the 1st Destiny crew would come out of the gate years from now,like the wormhle jump forward to another time .
like when the current Destiny are dead i, and just then the wormhole open and the whole crew from 1st Destiny crew (minus Telford ) come out .
it would be a great way to end the show.