Might be worth pointing out Sonny Gray was a tad under "dynamite" on the road. It would seem he pitched 26 of his 71 road innings in Baltimore and KC, and he did very well in those two parks. In the other parks, his ERA was a less than stellar 4.60. That's not a bad road ERA; plenty of pitchers having good seasons have road ERA's over 4.00. But it's really not dynamite. And last year, the only teams he pitched against on the road and kept his ERA under 3.00 were KC, Baltimore and Chicago. He got lit up in not only Boston, but also Tampa and Minnesota.
The Marlins might give up a ton for him, since Jeter (not so) secretly still works for the Yankees. But I wouldn't hold out for a good return from anyone else. Gray is nothing special, unless his opponent is actively tanking.
One of the ten best pitchers in the NL? No chance. He might not crack the top 30...