Maybe OF/DF becomes an arrangement of Greene everyday and then the starting lineup for the other 3 spots come from among 4 or 5 others based on matchups, who is playing well, offense/defense, whatever. And as we've seen, even if one of the 1 or 2 others isn't starting that game, they're on call.
The other thing is that maybe this group is an opportunity to put Greene in a corner or DH more often if Meadows can hold his own in CF and at the plate.