I don't follow what you're saying, but I think I'll answer what you're asking.
Generally one of two things happen. Either the park says, "We want you to build this," or the manufacturer pitches a ride to the park. Sometimes it's a combination of the two.
I'm guessing that B&M pitched the park. On the flip side, Cedar Point approached manufacturers about Magnum and Millennium Force. I can guess that Setpoint is pitching the parks about the "Seizmic" concept. I'm curious to know if the Flying Dutchman was an idea by Paramount or Vekoma. Either way, I'm sure Six Flags thanks Paramount for floating the R&D bill (that is, until they get tired of the reliability problems associated with the complexity of the trains, and by extension the resulting problems with capacity).
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Jeff
Webmaster/Admin - CoasterBuzz.com