Like, I wouldn’t quite say that Umineko borrowed anything other than maybe the unreliabilty in the narrative from “Ever17” (and even then it’s orchestrated in such a completely different fashion, it’s hard to imagine it’s from there were he got the full picture). And before that we already had some other examples, like “Sayonara o Oshiete ~Comment te Dire Adieu~” (that’s much more in the lines of Ryu’s structure than Uchikoshi’s are).
That one and “Kusarihime ~Euthanasia~” could probably be the closest to Ryukishi’s plot devices in their own way, besides also being fairly different in many instances. But even then, it seems he didn’t really read them (to be fair, they were only so much similar as well), as he gave Key in special most of his Visual Novel-related influences’ attention (and a bit for Type Moon as well, especially for the engine they gave him for Higurashi, if I’m not mistaking).
To make things more organized, I would put it like that (excluding direct actual visual novel influences):
Uchikoshi for one goes with espectacular Pseudoscience knowledge and implements it as a storytelling technique in all of his works (Zero Escape trilogy being more of a collection of his older (Infinity Series) works’ themes and plot devices in one huge story divided in three parts).
While Ryukishi uses of his work and life experiences to construct most of the themes and messages, while inputting some considerable literature knowledge and concepts from worldwide classics, and some studies that were influenced by their concepts (I could refer myself to many shinto-related material, and also some mystery writers he explicitly mentioned in Umineko as if it was a love letter to their legacy, but I would be more inclined to give more attention to the actually deep stuff he did with his meta-layered structure for Umineko, the “La Divina Comedia”/Jung’s Collective Unconscious thing that is so apparent after giving a fair look into all of the content).
As for Kodaka, he seems to like playing with investigative, storytelling, meta-fictional and otaku culture related tropes altogether in a huge crazy mix with over-the-top unique characters and premise. And at that, averting, heavily deconstructing and even straight pointing them out by name and everything (LOL) during the game itself. Kodaka’s games are an absolute joy to read because of that (it’s my definition of a fun crazy mystery ride besides some minor problems here and there), especially when he really knows were it would hurt the most in the players’ eyes when it comes to leaving everybody despaired (primary theme in the series) .
NOW THEN, TO REMAIN IN TOPIC:
I have one for Umineko EP2 me and my friends did sometime ago during a match of Cards Against Humanity online.