Some are certainly mongo, but definitely not all of them.
For me, it's easy to recognize mongo sock puppets. He simply cannot shed his typical markers. His ego always shines through as does his personal hatred. The target(s) and/or triggers of individual sock puppets reveal far more than their "real selves" realize. Most people cannot shed themselves when pretending to be someone else. Their writing styles, usual phrases, usual targets, topics that trigger them, and egos always shine through.
Same for most.
The only poster who was incredibly capable of disguising himself was Dain Ironfoot. That is because, in addition to new names, he constructed entire personalities to go along with them. He successfully created Beef,,,, and Jeffersonne, both LW oriented. Beef,,,, was vulgar and highly aggressive against RWers and Jeffersonne was meek but solidly LW. He created ATexan who was a nasty RWer and a ton of characters with literary backgrounds, like his online persona, Dain.
He did it to fill out a board with multiple, diverse characters when there weren't many participants, NOT to use to "attack enemies". Sometimes he even got into heavy & heated discussions with his own sockpuppets.
Until we ran a board together as opposite viewpoints on "CrossRoads" on TBQ forum platform, I'd never seen anyone so talented at creating sock puppets. I caught him using the same IPs and then he admitted it.
Mongo is NOT that talented. His purpose is to attack "enemies" and make his board seem more popular. So he is very obvious.
Many of the sockpuppets on Ken's boards are him, but many are from the RCC board under their own names or as their own sockpuppets.
Mike Scalese is the most prolific.