Day 5 is the complete song. Or at least Tony’s arrangement of the complete song.
Day 4 is sometimes an easier version of the song without all the embellishments.
That being said I have been with TAC for 7 months and I have never learned a song from here that I play. Partly because it was too hard in the beginning and now because I have a different routine for learning songs. (I too use Ultimate Guitar for a lot of my songs).
That’s not say that I don’t find TAC valuable. It teaches me unique techniques that I find invaluable when I go to learn a song.