I believed the ones shown were the first 106. THey are likely to have been the ones more likely to prove guilty of something. And I used the words “some of them” which I will stick with. “Some” could even be ten or less.
Pardon my cynicism, but they might just be the ones who had the most stuff seized.
97 of the 106 were named. The others weren't accused and arrested on or about May 17. They aren't named because they haven't been arrested yet, and the state doesn't want to give them notice of indictment until after they have been arrested.
My impression of the priority order given is that those indicted this past Tuesday were members of certain clubs (or gangs, if you are on the state's side of this dispute), and those not (yet) indicted are members of different motorcycle clubs (or gangs). That is the difference in evidence.
The state's legal theory amounts to conspiracy by association. Prior agreement to perpetrate assault is inferred or bootstrapped from the fact that assault occurred.