Quote:
Originally Posted by Max Cow Disease
I may be missing something stupidly obvious, but why was there a "map" to Luke anyway? R2 obviously had one piece of it and BB-8 the rest, but if Luke's intent was to bugger off, why leave a trace in that way? Where did the map come from? Did Luke foresee that someone like his daughter (if he has one) would find him one day?
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Luke left it with R-2 and then put R2 into sleep mode. He was waiting until some event, where he would be needed.
The rebels discover he other piece on Jakku, which happens to be the planet Rey (potentially Luke's daughter) is on.
Luke clearly split up the map. Left one piece with R2 and the other with Rey. Rey meeting with R2 triggers R2 to wake up, and they can bring Rey to Luke.