There is a definite link between these stories, the power of the sealed god plays a huge part in both of the Ch4s I've completed. Mathias was even drawing from it directly. This leads me to believe there is an end game bringing the whole group together to stop the dark god breaking free of his seal. Interested to see if this theme appears in the other six Ch4s. Hornburg keeps coming up with Cyrus too so going to assume Olberic is involved, the Therion dragonstone plot seems to allude to it too. Prim could easily head in that direction. Alfyn, Tressa and H'aanit on the other hand remain a mystery.