the most likely case is that they didn't have the master for the song (a la Soon As I Get Home), so they used Daz's pella which was pretty much all there was. i wouldn't call that a verse really tho, more like a half assed chorus
edit: wait, which verse are you talking about, the end of Pac's verse, or the lines later in the song, the "I'm dumpin, empty my gun, it's time to run cuz here comes the cops, i'll be duckin' em for blocks..." line?