my initial thought was that it actually didn’t use that many leitmotifs: just spamton’s two motifs, the world revolving + power of neo, and dummy!. but that’s actually more leitmotifs (5) than hopes and dreams (4: once upon a time A and C, your best friend, and snowdin town), chaos king (3: card castle, lancer, legend), and attack of the killer queen (3 or 4: queen, maybe another queen motif somewhere?, berdly’s 2 motifs), assuming i have everything correct! (i’m counting each distinct section of a source song as a unique leitmotif.)
watched the linked video for the first time, though i’m sure i’ve seen it plenty of times in my recommendations. i didn’t consider melody A’’ to be a variation of melody A, but i suppose it kinda makes sense. i assume this was one of the more influential analyses of big shot’s leitmotifs?