I think you could probably invalidate Dave's poll for the fact that it has incorrect information in the OP, it says the chance of success is 67% however we know, that attacking from two squares away doesn't actually negate the river defense bonus, and the chance of success is actually 32% (I think that's what the other odd was).
On the issue of these two polls being about the same thing, they aren't actually, the results of Dave's poll should have no impact on the results of Donsig's because that keshik could have attacked or not attacked from either the flood plain tile (after Joe's move) or the hill tile (before it) without a change in odds, there is no way of achieving an inconsistent result from these two polls.
On the issue of these two polls being about the same thing, they aren't actually, the results of Dave's poll should have no impact on the results of Donsig's because that keshik could have attacked or not attacked from either the flood plain tile (after Joe's move) or the hill tile (before it) without a change in odds, there is no way of achieving an inconsistent result from these two polls.