[weirdrandomthought]
What if, circa ESB, the 'other' that Yoda alluded to was.... Uncle Owen! What if we found out Owen had been a Jedi, also in hiding (maybe or maybe not Ben's brother or EVEN Anakin's REAL brother) but who had had a falling out with Ben for some reason. So in the theoretical ROTJ Owen shows up at the last minute to help Luke (and the Skywalker family) overcome darkness!
[/weirdrandomthought]