Interesting. This wasn’t listed on KD’s audition casting lineup that they shared last week on their own social media, so the park must be letting this outside company cast for a separate bluegrass show. My guess is this will be where River City Ramblers was last season. That show was a really good fit for that area.
Having another casting company in the mix for KD's entertainment doesn't hurt. Keep in mind that many entertainment production companies specialize in certain show genres.
Their strengths might be that they are better at casting certain performers and developing shows of a certain type more than others.
Windish seems to be the primary casting company for all of the 2022 Carnivale events for Cedar Fair this summer. They are the primary casting company for the 2022 summer shows at Cedar Point, Carowinds, and Dorney Park.
The company lists clients, (not sure if they are current or past), like Hershey Park, Herschend park chain, and Busch Gardens (Does not specify a specific park, so could be W or T or both).