I think you could account for hold-out by having the resolve window be longer than the trade-insert window, at least to an extent. The trade-insert window can'

I think you could account for hold-out by having the resolve window be longer than the trade-insert window, at least to an extent. The trade-insert window can't be too long, or it would leave lots of room for regret, like people who voted by mail for a candidate caught in a scandal two days before an election.