In my head canon, Ziggy got out of jail by joining the military and going to Iraq.I would like a sequel, where Ziggy comes out of jail some 10 years later, and with his cousin, they go hunting the greeks to avenge Frank.
The greek bosses are awesome, and they are not even greek.
(Tobias Beecher, on the other hand, escaped Oz and posed as a journalist to get out of the country).