Lets try to discern what happened.
1. So Rygart disobeyed some pretty important orders, if he came back alive he probably would have been court marshaled or something.
Or 2. Somone is trying to assassinate Rygart (maybe Gunnar?)
So they faked his death so he would be safe.
As allies, Assam took good care of Rygart secretly, Sigyn likely came to visit, serve as a messenger between allied countries, and also repair Delphine. (And maybe DO THE DEED with Rygart)
Once the situation at Mizram worsens, Rygart and co. covertly go to help.
Rygart wins, meets up with Sigyn, and go off to do more things to help with the war.
They're not going off to their happy ending, not yet.
Folse and Boton are with them so they're on a mission. Gunnar isnt present likely cause he was a traitor and got taken out.
Man I wish authors that stop their series prematurely would release like a summary of the plot events that will happen.