Not enough. Tell me this, if I reveal a screenshot by the time the desynch or disconnect occurs and a few more screenshots of the same game while playing the AI and reveal that, no matter how my opponent played, I had the game in (e.g.) 3-4 turns, am I going to take the win or not? Can my opponent fake desynchs/disconnects every single time and get away with it?
Moreover, another thing that can help avoiding desynchs is to play a few "unofficial" games with your opponent before the "official" ones with "illegal" decks (the later is for making sure neither you nor your opponent takes a look to the official decks that would be used later). I have done this with Acsabi, pwconfirm, RR and Blacksmith iirc. and it seemed to help establishing a more stable connection for our official War matches.