It's far from over for Gaspal. Not only does he not necessarily require to make the herbs himself(yes, Emperor ordered him to help, but he still have other summoner staffs at his disposal), but we still don't know who is the mysterious backer that was supporting him way back in s1. I doubt that, whomever that person is, would let him fall by the wayside just yet.
Still, that last line
Messenger: ....Duchess Argentine
was like a slap in the face. Felt pretty good seeing his expression after he heard that =03.