I'm failing to see why you're trying to make distinction between squads or solo players. You can play as Chops or Deborah while in a squad and still do things in the background while the rest of the squad is just annoying Jason.
And as @GeneiJin stated nothing says F you to Jason, like getting stunned by LaChappa and then helplessly watching him put a repair item in and still have time to waddle off away from you.
I'll actually give an example of something I've done as LaChappa. No, I do not main him, but if I'm doing repairs as my goal he's my go to. I had the fuse and a bat. I had another character nearby who I communicated with and they went inside on the phone. Jason had the box trapped. I tanked it. He showed up. He figured I probably could quickly be chopped down. Wrong decision. We traded shots, he went down. i repaired the fuse, sprayed and then body blocked the box. He tried to chop me down again at the box because he must not have had a quick grab kill. We traded shots again, he went down. In that process, the cops were called. And I was inside the house before Jason came out of the second stun.
There is the difference between LaChappa and Deborah, or AJ for that matter. Deborah and AJ aren't pulling off that entire set of events and they're breaking whatever weapon they have without likely stunning Jason once.
And that is why Big Chops is the best repair character in the game.