With hope it is a moot point now that FG is on the Cartoon Network, but here is further proof that there is no rule about how many episodes must be aired before a show can be syndicated. Syndication is simply a distribution method that can be employed at any time parties mutually agree to terms.
Recent news: A&E Network has snapped up rerun rights to "CSI: Miami" just as it wraps its freshman year on CBS. It has secured a syndication sale before the end of its first season, in other words. According to The Hollywood Reporter, the terms of the deal call for A&E to begin airing a weekly rerun of the "CSI: Crime Scene Investigation" spin-off outside of primetime starting in the fall.