That's just a bit classic US TV dramatic ending - Main guy/Goodie offs THE biggest baddest evil boss man ever....Only for another EVEN MORE bigger/badder evil boss man behind him to appear out of the shadows.
The groundwork for that is already there - The Mexican cartel owners were technically above Chicken Guy in the pecking (sorry) order. Could see series four see the return of Bell Ringing man and his cohorts to fill the gap he left and/or avange his death (assuming they treat his death as a loss business wise).
Though I would add that I have never been able to precdict any storyline in BB, literally none