Chris Mansfield (Sante) didn't specify that it was 3+1. He just said that Ayra did it in the 80s, according to Billy.
Honestly I don't know who to believe anymore, and Brian Kuh isn't exactly the most reliable source of information on things, but he IS close to Billy Mitchell.
Kuh says "6-man"; Mansfield just says "kill screen." Then you have Ayra's video posted earlier in the thread, which really makes me doubt that he got a 3-man kill screen. He certainly doesn't talk about his game as if it's that good yet.
Honestly I'm just kinda tired of thinking about whether or not it's legit.
Everything taken together, I'm leaning toward a 6-man "Sanders kill screen" (there's one to add to the terms list), at best.
I kinda like the first two on the list being Billy and Steve, even if it's not true. I also liked Ayra being on there to represent the "spot of the unknown killscreeners" who may have existed in the 80s, but I'll let it go.