Derek Rose was a generational talent. From the 2007-2008 to the 2011-2012 season he was arguably the second best player in the world, just behind a young LeBron. And if LeBron stayed in Cleveland (rather than moving to a loaded Heat team) maybe Derek Rose would have been the best before his injury.Generational doesn't mean that he was good relative to other players that have ever played at Illinois. It means that of an entire generation (or usually a long timeframe), you are a unique 1 of 1. Zion, Kevin Durant, and Anthony Davis are probably the only generational players who have come through CBB in the last 25 years.
With your logic, if Morez transferred down to like Illinois State and dominated the MVC, he would somehow be a generational player because most ISU fans would've never seen a player like that play for them.