I've seen enough and the Twins may have too. Your point is absolutely valid, but I think it would be more appropriate if the Twins still viewed him as an "upside" guy with a future in this rotation. How could they? Even if he strung together 3 great outings, there's still that chance he comes out and gets absolutely destroyed next time out. And since the start of 2011, those stretches have lasted for games at a time.
I think "trade value" is mostly a lost cause at this point...you could argue that moving him to the pen as a lefty strikeout specialist would actually ENHANCE his value to a contender in July, in the event he succeeded in that role. Because whatever this is...it ain't working.
The pen is a different mindset and it might suit him. When you start... You have to mix it up. That hitter you are facing in the 1st is coming up again to face you. You can't just bring it... It's a mind game and he just might not be grasping the mind game part.
If you put him in the pen for a LOOGY role or set up guy. He won't have to think. He can just bring it and challenge hitters. 2 seam, slider, 4 seam, change, slider. Put a k in the book. It might work. It just might.
I've also heard he doesn't handle pressure well. But as long as he doesn't think. As long as he just throws. Brings it. Who knows.