If that works that way at all depends on the group dynamic. It is easily possible that a not so bright individual takes an (unofficial) leadership position in the group and overrides the input of smarter members. Think of any meetings with various hierarchy levels in a company.
The ARC AGI questions can be a little tricky, but the solutions can generally be easily explained. And you get 3 tries. So, the 3 best descriptions of the solution votes on by 10 people is going to be very effective. The problem space just isn't complicated enough for an unofficial "leader" to sway the group to 3 wrong answers.
