this is kind of off the wall, but, given the lack of a real leadoff hitter on this team and the profile of their best batters, I'm thinking that Soto maybe should be pulling a Schwarber and leading off. Slot him leadoff, Bell second, and Cruz 4th, with either Garcia or Ruiz #3 and #5. SABR lineups emphasize 1, 2 & 4 for your best hitters, with 3 & 5 as your next best. Ruiz hasn't shown Garcia's pop, but is far less strikeout prone (10% of PAs vs. 20%) , and walks a bit (8% of PAs). I kind of like Garcia's average at #3. Average drives in runs more than BBs. #3 comes up a lot with 2 outs, so a 2 out walk is less valuable than a 2 out hit (a hit can be for extra bases).
So, were I experimenting a bit, I might go:
Soto
Bell
Garcia
Cruz
Ruiz
Yadi/Thomas
Franco
Cesar
Robles
Robles actually has a higher OBP than Cesar the past couple of months.