We also have Grom asking about a dagger, being pointed towards Sorcerous Sundries, only for a white Dragoborn to be the one who shows up there. It's interesting that you consider the murdered Dragonborn's family member to be suspect, I'm not sure.
If a Dragonborn came to purchase the dagger, and the fellow at Sorcerous Sundries thought a "Crane" was looking to sell it again, then Crane might be the Dragonborn. But, in our latest meeting with Fel, he's refered to as the 'Butler', and he keeps referring to his master, so concievably the Dragonborn could have been another factotum for some noble. That would also track as to why the propietor thought you had brought in a dagger to sell for someone else.
All in all, we have a pretty good lead with Grom, so I voted to go back to the cemetary. It'd also be interesting to learn if the Dragonborn's corpse has been disturbed.
When I first learned about our suspicious Dragonborn, I considered that the murders where being committed by a daisy chain of the victims, either being possessed or possibly even reanimated.
It seems like body parts were only taken from the Bard and the Dragonborn so far.
