More roster shuffling

A minor league pitcher is released, and a bullpen pitcher is sent down and replaced with another prospect. Guess which ones.

http://www.tsn.ca/mlb/news_story/?ID=211387&hubname=mlb
The answer is that Thomson was released, despite being more effective in his rehab than Zambrano, and Gronkiewicz, the one pitcher who was effective yesterday, was sent down, with Wolfe getting the call in his place. I suppose if you expect to need a long relief guy, the one who pitched 4 innings yesterday is a bad choice, but he'd better get called up again if De Jong has another bad outing (which has described two of his three so far).