The closer is needed NOW!
Wicks pitched last night and will need one more game. With a forearm strain that could lead to TJS so that is why they shut him down and are doing a slow build up.
With Brown tossing a 7 inning no hitter it allows Wicks to go into lower impact middle relief.
Add to it Horton will be forcing a rotation spot.
I have felt that they should be doing a 6 man rotation for a while now. What this does is basically takes the 100 pitch counts and gives opertunity to get that extra inning with out freaking out on burning a arm.
This extra inning takes away from the tweener crowd.
In other words. Say they decide to move Hayden into the rotation. Then up the pitch max to 120. This gets most starts 6-8 inning range. This will in general require 1-3 pen arms. Even then they could put Wicks in if they need a 2 inning stint.
Now on a legit closer. They don't have one. The closest guy in the system is Daniel Palencia. He lacks a strike out pitch but hits 101 frequently.
Give him a fork or knuckle curve then we are talking a legit closer.
But that is not a real thing right now so trading for Miller would pay off and they might take Daniel in the deal as his top end is at that level and they are not on a win now scenario.