Unless the prosecution can prove that the trades meaningfully moved the market prices, it's probably going to be really hard to use the term "leaking".
I can't shake the feeling that there may be political reasons to not even attempt that angle. What legal precedent would it set if a judge actually ruled on that and the prosecution won? Which entities within the government would be financially inconvenienced?
So in prediction markets I've heard a lot of times people will collaborate in order to make certain predictions pay off higher sums by having more people put money on a certain bet.
Is it true with these markets the more people bet on a specific day and time, the value will increase more, increasing the overall payout? If that is true, I wonder if they're looking at anybody else helping place the bets or a group of people trying to wager a higher amount of money to increase the return?