Just got a confirmation from another subscriber (had a hidden/private tree) on ancestry.com - looks like I got the right guy. After Sanderson/Saunderson's wife passed away early in 1922 in Queens County, New Brunswick, he moved out west (he also lost an infant daughter at about the same time). According to my info he was born Feb. 23, 1888 in Queens County, NB.
No other info is known about him - guess he never came back to NB to visit his surviving children/family etc.