It was by far the weakest and confused as Rey had her own theme and Luke’s, it’s been said that JJ interfered with JW’s magic making and tbh a lot of it doesn’t appear to be his work?
If you’re talking about the use of “Burning Homestead,” that’s not Luke’s theme. Luke’s motif is actually the same as the opening crawl. If you watch ANH, you’ll notice this theme plays when Luke first appears (when Beru yells “Luke! Luke!”), when Luke gets up from the table and leaves (Beru says “he has too much of his father in him”), the shot of Luke walking inside the Lars homestead right after Binary sunset, when Luke is shooting at the Stormtroopers on the Death Star (Wilhelm scream) and gets out his grappling hook, and when Luke is the last one left in the Death Star trench after Wedge leaves (switching on his targeting computer).
Burning Homestead and Binary Sunset use the Force’s motif, which can also be heard when Ben first explains to Luke about the Force (“Vader was seduced by the Dark Side of the Force.” “The Force?”), when Ben gets that look on his face when he decides to sacrifice himself, and when his voice tells Luke to “use the Force” during the trench run, before switching to Luke’s motif when he switches off the targeting computer.