My Rusthenge tie-in was, essentially, that the body found in Rusthenge (Blanton) was Blanton Valdemar, a relative of the Valdemars that remained in Iron Harbor after construction on the Valdemar Mansion there was abandoned. In my version of events he was able to get out his name and that he was from Sandpoint before he passed.
The Elders of Osprey Cove sent a missive to Sandpoint about Blanton's death. The Sandpoint town council decides to send a group to Osprey Cove to retrieve the body and the party ended up getting chosen and/or volunteering (2 in my party chose the background that makes them members of the town guard).
The transportation to Osprey Cove was provided by the Scarnetti's (so kind of them) so I was able to start some harmless hijinks that indicated the Scarnetti's might have a less than favorable attitude towards them. After their adventures in Iron Harbor my party returned to Sandpoint, with Blanton's remains in tow (and even brought Derrol Finnick back to "civilization" with them).
Returning to Sandpoint after having resolved the issues in Iron Harbor the party now had their first little bit of renown, which played into why Zantus asked them as a group to investigate under the boneyard.
Returning Blanton's remains also gave a stronger hook (from the party's perspective) as to why Kaleb Valedmar wanted to treat them to dinner at the Rusty Dragon, as now it was framed with wanting to thank the party for returning the remains of a member of the Valedmar family.