They're not starting all of Rafaela, Duran and Abreu, I'd be surprised if two of those guys are starting. Duval isn't a good option to start, giving his age and injury history he should be relegated to a platoon role. He fits the need of a RH-hitting bench bat that can play all three outfield positions. He's actually a good fit for the roster, but he has even splits, even reverse splits at times. That's fine, even preferable for an everyday player.......which Duval is not.
All this makes the argument for keeping Verdugo, you need starters in the outfield.