I wait for that, and for another similar "mystery" about the disappearance of the Greenland colonists when the Medieval Warm slid into the Little Ice Age. I suspect they gradually increased their hunting and went for longer and longer hunting trips as agriculture became less productive. They had met and knew of the indigenous folks and it would be natural to accompanythem on occasional then more than occasional walrus and seal hunting trips. I would bet that the Inuit have traces of Nordic genes.
There's evidence they explored and sailed the northern bays and waterways - and may have ended up, eventually, in North Dakota - where were found, early on, "white Indians with blue eyes" - the Mandans