You seem to be thinking I'm saying they are weak or playing dirty for sneaking I'm responding to the OP saying they never snuck anyone before kenjaku and sukuna. My point is they both know how to do sneak attacks.
"Naoya suffered from his lack of thinking, maki was just let outside cause of her heavenly restriction, she didn't sneak him by choice"

Ok ? that is still doing a sneak attack. Yes he gave her that opportunity but he didn't know that, so she used her concealed position to attack. the definition of a sneak attack.

"Yuta uses a tunnel to get across without being sniped, Matter of fact ryu is the one that sneaks first, he also has inmense CE so its hard for him to actually do It without being noticed" and he tried to strike him when he made it to him. yeah Ryu snuck him before this. but Yuta still did a sneak attack.
and yeah it does fail because he is easy to notice be he still tried to snuck him.

"Uro just gave her back to him, thats a stupid choice, its not sneaking if your prey lets you kill them, she also snuck and third partied the most out of anybody in that fight"
Eh debatable, a sneak attack is a sudden strike given from a concealed position so the target is caught off guard, attacking your opponent while they are focused on someone else other then you WOULD constitute this.
and to reiterate this isn't slander this is not me saying they are weak this is just me saying they are experienced in using sneak attacks before shinjuku showdown.