I've only watched the first part but three things stood out. One, Agito's character is expanded in the series but the fact that we never really know if he's a good guy or not is sort of the point of his character, especially given later events.
Two, X-day is completely plossible since Chronos not only has the means to rig elections but can also simple Zoa-form every potental candidate since they don't need to be complisite in the plan since Zoalords can control Zoanoids, a fact that is shown in the show so they don't even have the excuse of not knowing that.
Three, and this is sort of a major one that seems like a miner point. Murikami's gun. It doesn't matter if it is to big for a human to fire since, and there is no way anyone who has seen the show can't know this, he isn't human.