If you have two .350 OBP guys up 1 and 2, the 3rd batter should get up with a man or two on base, more often than not. Maybe I'm wrong, and because two get on base sometimes, the chances of zero on base is higher than 50%.
Anyway, I used to think the 3 batter should be the best batter. Now, I think the #2, with #1 and 4 close to it. The #4 should have more power, and the #1 a better OPB.
One key is that the 5 should be better than the #3, but it's close.