NeverarGreat said:
As to Ben being on the same planet, the reasons for him being there are given both in the Radio Drama, and as subtext within the actual movie. Obi-wan was the teacher to Luke’s father, and was tasked with giving Luke the lightsaber when he came of age. I don’t see how anyone could chalk Ben’s presence up to mere coincidence.

In the 1977 film, it’s an unexplained coincidence. Ben just happens to have known his dad, just happens to live near him, just happens to have his saber, the droids just happen to free-fall near him on the planet, and they just happen to be sold to Luke.

In the radio drama (my personal canon, by the way), it’s little more than a suggestion and far from an explanation. It was over twenty years before it was explained.

NeverarGreat
Tekka on the other hand has only a tenuous association with Luke due to his possession of the map, and gives no indication that he is aware of Rey’s existence.

At what point does being the only person in the galaxy who knows the whereabouts of Luke become only tenuous? There appears to be a very important reason why Tekka knows where Luke lives and why he himself lives near Rey.