Just watched Coco again by myself like a loser and sitting on the toilet made something occur after a bit of googling.
I brought this up to my girlfriend but she was no help since she’s never seen it and told me to Google it so I did.
Stealing the guitar from the plaza WAS in fact a family matter because it was Hector’s guitar. He stole from the dead on a day you give, and cursed himself because his family hates music.