Those sources are wrong, and don't trust an American source anyway. Due South is a Canadian show. Americans have no idea what happened. As far as they know there was the CBS network series that lasted two seasons (1994 to 1996) and then it disappeared and came back later in syndication with new episodes and a new Ray, giving rise to the idea that it was a different series. Due South ran for FOUR seasons in Canada on CTV, 1994 to 1999, and the new Ray came in at the start of a new SEASON, season three -- not a new series, let alone a spin-off. Season three was 13 episodes (1997 to 1998) and season four was 13 episodes (1998 to 1999) in Canada. THEN a deal was made to syndicate seasons three and four in America. The Americans didn't want two thirteen episode seasons. They like their 22 episode seasons in the US. So the Americans bought only 22 out of the available 26 episodes and aired that as one season. And since by this time it had been about three years since the show was available at all in the US, American fans started saying "Oh, this is a brand new series. A spin-off."