Very good art,and I can see this happening! The blades need to bee a little longer though,because with his fingers extended,even Altair's blades go 1-2 inches farther than the tip of his middle finger.
Halsey would probably be part of the Assassin's crew lmao. Some important members of the UNSC could be Templars and Lasky would just be caught in between, but favoring the Assassins. Just my point of view lol
The last of Desmond's bloodline, John 117. It does make sence that John would be a descendent of Desmond, their stories have some ties with the ancient civilization that no longer exist and choose them to hold the key to save their worlds.