I'm all for getting another pen arm. We could use a strong number 2. Getting one would turn Kelly, Barnes & Co. into a formidable set-up crew.
However, I think we have a pretty good pen right now without counting on Thornburg or Blasier for anything but gravy.
Although our pen might not be great after Kimbrel, I think we're pretty deep:
Kimbrel
Kelly
Barnes
Hembree
Workman
(These 5 are basically locks.)
3 from Wright, Pom, Johnson or Velazquez
Thornburg
Brasier
Poyner
Walden
Scott
These are 8 decent pitchers, of which we have to choose the best 2-3 to fill out the rest of the pen.
We don't "need" Thornburg or Brasier for a key role. It would be nice if Thornburg stepped into the 2 slot, but Kelly has done pretty well for 1.5 seasons, now.