Who gave you that bad crack you're smoking?
Since you gave me a bitchy answer, I'll give you one as well.
Need I point out the number of original rides remaining at Six Flags Great America since Marriott's opening day? Columbia Carousel, Rue le Dodge, Whizzer, Turn of the Century (now Demon), (Orleans) Orbit, Hometown Fun Machine, Triple Play, Logger's Run, Yankee Clipper, East River Crawler, Pictorium (still an operating movie theatre!)--all of these are still operating to this date at Six Flags Great America. You cannot tell me that Cedar Fair would have kept all of these rides, especially one-of-a-kind rides like Whizzer! Cedar Fair would wash their hands of it right away, just like they did with Worlds of Fun's Zambei Zinger.