After reading the lyrics, I think the song may have been chosen for its message of forgiveness. I'm sure they all know deep down inside that Casey is in dire need of it right now.
Notice that some of the ending lyrics of the song are similar to "Amazing Graze" (Casey is a wretch that needs to be saved?) JMO:
"....Choir of angels sing
Glory to the newborn King
A baby changes everything
A baby changes everything
"
Notice that some of the ending lyrics of the song are similar to "Amazing Graze" (Casey is a wretch that needs to be saved?) JMO:
"....Choir of angels sing
Glory to the newborn King
A baby changes everything
A baby changes everything
"