Our line-up is always going to be problematic because we don't really have the perfect lead off hitter to set up the 2 hitter who could be Bogey or Nunez or Benitendi when these latter two are back in hitting form, but I think Betts is best at 3 (how else will he have a shot at the triple-crown) and Martinez at 4.
What we need at leadoff is Betts without the power, or Betts with a whole lot of power coming up after him. Or a true lead off hitter... the guy who chokes up on the bat, pokes hits over the infield, walks 100 times, beats out infield singles, steals 40-50 bases and has an OBP of at least .375. In other words, A PEST. We need a PEST... normally such guys are second basemen.