I think you are on the right track here. We need to examine William and his wife Abra(h) more closely. I think the reason this line has sat at a dead end on Reese for so long is that he may not exist. The only other logical reason I can think of is that he was the first to move into the Pembroke area.
I will get a hold of my aunt and see what information she has on Reese and William, and find out where she got her original data from.