Severino and Mitchell. Seen enough of Pineda as a starter. Perhaps relieving an inning or two will be his role.
Between these three guys, pick two to go to the bullpen (with the 3rd being in the rotation):
Pineda, Severino, Mitchell
At the cost of a backup catcher (at best), an inexpensive switch-hitting OFer who can play all 3 OF positions and at worst is a 4th OFer? IMO you don't
For a real contender, guys like Pineda, Severino, Cessa, Green & Mitchell are #4/5 starters at best, since you can't really be sure what you're going
Great arm bad head ...Might be the best spot for him.
Finally a plan to put the Astrodome to use.