-- Jose Fernandez has never pitched more than 172.2 innings in a major league season. And, in fact, the season after he pitched that many innings, he broke. Now he's up to 80.2 innings in his first full year back from Tommy John. I love the guy and would at least want to be in on him if the Marlins are shopping him, but: a) you only get him for two and a half years, and b) there's a huge question mark about whether he can handle a full season plus playoffs in any of those three seasons (especially this one, his first full season since TJ).
-- I don't think Julio Teheran is nearly as good as people think. The Braves have been trying to trade him for two years, with no luck. And given that he's on a reasonable contract, they have no incentive to drop their demands -- they can just continue to keep the price at whatever too-high level it's been for two years, and have him lead their pitching staff into the new stadium (although, by then, he may well be their #4 starter).
-- Matt Harvey and Sonny Gray were interesting targets in the off-season. And they're still interesting -- but as buy-lows. You tend not to get those in the July trade market. If Oakland will take Swihart, Owens, Chavis, and Rijo for Gray, Valencia, and Reddick or something like that, then great. Otherwise, meh.
Me, I wouldn't trade Moncada, Benintendi, Espinoza, or anyone on the major league roster for any of those guys. I'm not even sure I'd want to do more than one of Swihart, Devers, or Kopech for anyone but Fernandez. This changes if Chris Sale (more durable, three and a half years of control) becomes available, but I don't think the market is right for a big, splashy trade. I'd rather give E-Rod and Buchholz a couple turns through the rotation, and if it isn't working, trade Owens, Chavis, and Rijo for Drew Pomeranz or something like that.