Jake Arrieta had done nothing in his 3.5 year career, and had a 7.23 ERA and had a walk rate of 6.5, when the Cubs took him in trade for Feldman at the age of 27. I don't think the Cubs regret asking for him in a trade instead of waiting for him to be released. Not saying the same thing will happen with Peralta, but there are lots of similarities between him and Arrieta through age 27. I believe the Orioles also took away Arrieta's best pitch and the Cubs let him throw it again. I just don't see anything about Peralta that makes me think "if he could just put it together, he'd be really good."