G-Unit started with 50 Cent, Lloyd Banks, and Tony Yayo. A combination of hubris and label pressure from Interscope's Jimmy Iovine led the imprint to expand to the West for Game; the South, Young Buck. (Game clearly, uh, didn't work out.) Buck was more reliable and less prone to craziness: he stuck by the mercurial 50 through beef after beef; he made some good records that sold well (one platinum!).
But then, in 2007, Buck made some statements that led 50 to think he wasn't being loyal, giving Fif the reason he needed to kick the Tennessean out of the group. Egad! So, then there was a flurry of diss records between ex-employee and onetime boss, which wasn't that interesting until 50 released an audio recording of Young Buck crying on the phone, begging to be let into G-Unit again. Buck claimed the recording was doctored, but it didn't matter: people had long before tuned out.