Having a previous saved game beforehand does nothing for you when you are 10 hours ahead into the game. Normally people would think he would respawn like any other NPC. Too many people are having this issue and Ubisoft should be working on a bug fix or at least allow everyone with this issue access to the upcoming new game plus mode
I can confirm this issue will be fixed in a future title update, we do not have an ETA on when this will be released but please keep an eye out for when this is announced.
It will be announced on the official Twitter page, website and in game.
Twitter - https://twitter.com/assassinscreed
Website - https://assassinscreed.ubisoft.com/g...s/news-updates