Niemand
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1. Full control (specifically, Flight and Dimension Door) should be banned in online Tournaments. I think this is obvious – for the reason that is clear from your example.
2. Even if there were 40 full controls: the stronger one should be the winner! An obvious avoidance of the final battle is a sign of weakness, and in a "jumping" battle, he will almost certainly lose.
In Heroes of Might and Magic 4, there is a great rule for this case.
For all long games, a final battle can be scheduled. This means that by the end of the designated day, each player must leave one army on the map (the rest must be dismissed or hidden in cities/garrisons/mines). The resulting save must be passed to the organizers, and the latter will create a save-arena with two armies that are an exact copy of the players' armies on the map. On the arena, the rivals will have a final battle, and its winner will win the game.
Something similar would be useful in Heroes of Might and Magic 3 as well.