I've seen a lot of hate on yay recently due to his performance at DSG. Many call him washed, Chamber one-trick, or a bad player.
Now about Demon1: he was rumoured to be a DSG pick-up, and he was brushed off as a bench tier 3 player when EG picked him up -- as many were clowning the organization for picking up such a player. Hell, some people were saying he was better off playing with DSG than EG. But look where he and EG are at now: a Masters AND Champions representative; EG made it this far because of Demon1, who frankly has been a demon due to a stable system around him. Now, the narrative has shifted that EG are nothing without Demon1 and will struggle at Tokyo without him.
Now imagine he did get picked up by DSG. Would DSG have done better with him? Maybe or maybe not, but one thing is certain: he wouldn't have had the same clout and in-game presence as he has now. He'd be a promising prodigy, but that's all he'd be, not the world-beater he is currently. But what about the current Demon1 on the current DSG? Oh, they'd STILL get relegated.
Valorant has taught us time and time again that a good coach matters and a good system matters. Look at how SO MANY teams (Sentinels are a great example) struggled because they didn't have one or the other. Yay is only one player out of five -- he alone can't carry a team. But I won't excuse that he doesn't look uncomfortable on Jett. He has not been performing up to par as many others. However, the argument that Derke, Aspas, Something, and even current Demon1 would carry DSG is honestly laughable. They'd struggle because they wouldn't have a functioning system around them, maybe even more than yay.
Is yay washed? Probably not. Is yay a bad player? Probably not. Is yay the reason DSG failed? Absolutely not. Would anyone else other than yay have made the current DSG marginally competitive? Absolutely not.
TL;DR: yay isn't why DSG failed; Demon1 wouldn't have the same level of presence as he has now on EG if he were on DSG.