Re: Consistency at the top of the lineup
If you were to compare the times Votto leads off an inning compared to the rest of the #3 hitters in the league, the difference probably wouldn't be significant. And then to consider how many of those times you could assume that there would be men on base compared to the rest of the league just in those at bats, the difference would be even smaller. Across the course of the season, the difference is simply minimal.
Then consider each players OBP. Paul has a .400 OBP in the 2 hole, but in only 15 PA... so he's only 1 bad game from dropping down to about .315 due to small sample size. Robinson has only a .238 OBP in the 2 spot. Cozart is at .304. Would it be nice to have a guy get on at a .415 clip in the 2 hole? Certainly, but that's not available.
When you really break these down, the amount of hand wringing over the topic is truly not worth the impact it actually makes.