TA doesn't have the OBP for me to be a leadoff guy, he also doesn't work counts or take walks. He is the prototypical #2 hitter. He can hit the ball anywhere on the field, which is ideal in the 2 spot.
Luis right now for me would be a better leadoff guy as he's probably the 2nd fastest guy on the team who has the OBP to be a successful leadoff guy. He also can hit leadoff HRs like TA if he feels like it.
Ideally I would put Luis in the 3 spot but seniority dictates lineup construction or something. Abreu would be driving in more runs hitting 4th with TA > Moncada > Robert than he does currently, by hitting 3rd