Hader isn't going to go back to the rotation. Healthy Zach Daviees and Nelson will help them. When I mean young arms I'm thinking Woodruff, Burnes, and Petrala.
Yep.
Woodruff looks to be a 4/5 starter - he's been inconsistent. He could flip the switch and become an ace, but I wouldn't count on it.
Peralta has looked very very good; he needs more than just a fastball to be a solid starter, though.
Burnes could be the most consistent of all of them.
Davies was a good back end starter when healthy. Suter is another good one, just not a lot of velocity, but that's over-rated (see Trevor Hoffman for a pitcher who barely touched 90 on his fastball, but just baffled guys with offspeed stuff).
No one thought the Crew had enough pitching to contend at all this year, but a bunch of no-name guys put up some of the best numbers in the league - without Nelson, and with several starters out for significant portions of the season: Miley, Suter, Davies. If they have all of those guys and Nelson healthy in 2019, it would not be surprising to see them with one of the best pitching platoons in the Majors.
They are going to need a catcher, though. Pina was ok; Kratz is pretty close to retirement by now. Not sure they have any minor league catchers to fill in. Maybe Vogt will be back, but no guarantees there.