We are indeed looking at the same family. Are you a descendant? I am a descendant of the Edward you mention. His wife was Caroline Cook. I'm descended from their daughter Jemima who married JHG Bray.
Where did Edward serve the HBC? I know his brother William served for years at Ft. Ellice. And there are some records of Edward hunting for him?
By the way, most people studying John and Le Malin are fairly certain that they are not brothers.
I would be happy to discuss the family with you directly, if you wish.