I have a feeling that a good number of these ride removals are — as has been said here before — mostly a product of the chain choosing between closure and deferred maintenance. The former is always upsetting and consistently leads to bad vibes, but the latter is dangerous when it goes on for too long. I'm by no means an apologist for the chain (see my other posts on this website), but I know that the removals mean more resources are freed up overall with potential for bigger gains in the future.
Now, on the topic of Cedar Point: I think it had the least amount of deferred maintenance (whether by being the golden park or not) and therefore did not see as many disruptions to its lineup. It had a flat, sizeable plot of land where a new coaster could be built. It also had a "New for 2024!" coaster that was SBNO for almost the entire season and needed something to make up for that. The stars may have aligned for the park to get Siren's Curse, but I don't think it was explicit favoritism. If I was in charge of the new Six Flags I'd look into making Carowinds and Canada's Wonderland into my Top 2 golden eastern parks since they are very highly attended and can be open a lot longer than Cedar Point can be.
So far, Kings Island has lost Firehawk (replaced in a timely manner by a giga coaster), Vortex (park management decision which they regretted making), Slingshot (replaced by two new non-upcharge flat rides), and Xtreme Skyflyer (an upcharge attraction that is being removed from many other parks). KI has been extremely lucky throughout this merger process.
Sidenote: has anyone else noticed that the (Legacy Cedar Fair) parks that lost a major coaster kept their Skyflyer (Carowinds, KD) while the parks that did not lose a major coaster lost their Skyflyer (CP, KI)?