Jay makes me a hypocrite. I'm always side-eyeing people that use vocal tone or everything other than technique to name someone a good vocalist, but he sounds so special Joy is my bias in Red Velvet, and even if her tone is pretty, it's pretty clear that Seulgi and Wendy are better, even if I didn't know vocal tiers, but IDK what happens when it comes to Jay
I'm not a vocal nerd, but ZB1 would be my top 1 based on vocals. They have the most vocalists who can support and the lineup is even smaller than others (sans Kep1er). If we had an ot11 lineup, Jay and Park Hanbin would make it, and by the review I saw, PHanbin is like C- (or a really high D+), and Jay is similar to Gunwook and Sung Hanbin. Even if others have a better main vocal, it's not someone like Chen or Kyuhyun who are too much better and would compensate the lack of vocalists.
I know a lot of people who like Jay for his tone and stylistic ease! I personally like listening to him because it always looks like he's having fun while singing and he interprets a song well. Imo, support is a great way of deducing vocal skill, but it's not the only factor in what makes a good vocalist.
Krystal is a similar case for me, I know she isn't great but I still love her singing.
Yeah, I debated putting ZB1 at #1 but Jaehwan and Sejeong are so good that I just couldn't do it lol. Either way, it's nice that we have such a vocally strong overall lineup in the 4th Gen, especially after Kep1er.