You have to look at overall OBP when assessing where a player should hit, specifically the leadoff hitter who you want getting on base. Just because Escobar has a high OBP in a small sample of games where he lead off, doesn't mean that if you stick him in the leadoff spot his OBP will go up. OBP is a function of the player skill which determines where the manager puts him in the lineup, not vice versa. A player might see a statistical affect based on protection or hitting in front of a pitcher, but the effect is very minimal.