The JK franchise is a potential cash cow...
But the deciding to keep his saber and visit the acadamy (we know he visits, but not whether or not he stays for an extended period at some point) sounds too much like the happy ending to me.
There is however, Tavion. She might be pissed, but I think she was thoroughly cowed by Kyle, and his mercy. All I'm saying is she's more likely to join the Acadamy than start a war.
Who needs a brother anyway?