Player rating for tournaments across all installments of Heroes.

This means you simply have nothing to say, because, as I understand it, this thought never occurred to you before. You can't compare two maps if they are different. One map was completed by the leader in 10 days, and the second-place player in 12 days. The same players completed another map with different results – the leader in 100 days, and the second-place player in 150 days. And on a third map, the first player completed it in 30 days, and the second in 31. Tactics change, but that doesn't mean that one player suddenly became worse than the other or drastically improved their skill level. He is consistently in second place. It simply means that on this particular map, one player's tactics are better than the other's. But the players' strength couldn't have changed so drastically back and forth.