Gurriel can play 1B and both Springer and Vlad will DH plenty. Kiermaier probably doesn’t need more than 3 starts a week and won’t play against Lefties. If you have the option of adding a Conforto you make that move. There’s at-bats to go around. And injuries usually take care of most of those issues.
Our 4th Outfielder is currently Merrifield and Biggio? And Merrifield might actually be the Starting Second Baseman. Lukes the only other Outfielder on the 40-man.