Joe Maddon has never been shy about using platoons.
He says that he needs to keep his bench players "fresh" so he tries to start them at least one a week.
A platoon situation in the major leagues is really a concession that the team does not have one full-time major league player at that position. You have a player who may hit right handers better than the other guy, and thus the lineup card is dictated purely by match-ups.
The Cubs have found themselves in an unusual Triple Platoon situation. Ian Happ, Albert Almora and Jon Jay are all playing regular center field for the Cubs. Add in the occasion move of Jason Heyward to center to have Ben Zobrist in right, center field has become a summer park district program.
Center field production is one of the many Cub 2017 issues.
Almora has played in 49 games. He is hitting .268, 3 HR, 12 RBI, .322 OBP.
Newcomer Happ has played in 24 games. He is hitting .213, 5 HR, 10 RBI, .315 OBP.
Bench player Jay has played in 49 games. He is hitting .296, 0 HR, 10 RBI, .386 OBP.
You don't think your center fielder will be the tops in any category (Colorado's Blackmon is an exception in RBI), but the leaders in categories show how far off the Cubs players are:
HR leader: Judge 18.
RBI leader: Lamb 56.
BA leader: Zimmerman .365.
OBP leader: Trout .461.
Contributing to the Cubs offensive woes is that default starting LF Kyle Schwarber is hitting a season low .170, 10 HR, 25 RBI, .297 OBP. Also in a funk (on and off the field) is Addison Russell. He is hitting only .209, 3 HR, 19 RBI and .291 OBP.
Normally, Happ, Schwarber, and Russell would be candidates to be sent down to the minors to work on their game (physically and mentally). But there is no one in Iowa is begging for a promotion. The best CF is Jacob Hanneman, but he is hitting .400 in only 5 games (0 HR, 3 RBI). He must have been hastily promoted because in AA he only hit .180, 1 HT, 6 RBI in 34 games. Likewise, the Iowa shortstop, Ozzie Martinez, is hitting a light .219, o HR and 8 RBI in 40 games. The best Iowa middle infielder this season was Happ.
In one respect, the Cubs could load up the bus and send a bunch of players to Iowa. But in another respect, there is no one worthy of being called up to fill their places.