Not really. Let me just say this, Rick Ankiel and Todd Van Poppel (although he's doing pretty good this year) had by far better number than just about anybody ever in the minors. Ankiel was completely dominating!!! The 2nd coming of Cy Young, etc. Where is he now??? Until you succeed on a constant basis in the major leagues...that stuff dosen't really matter, so you can gauge a player by what you see in the minors, but with reserve of course.
Oh, and I was wrong about Duke, he rarely gets it over 90 of at all. I think I got Frasor and Duke's scouting report mixed up, my bad. But I still think Duke can succeed closing in that pitcher friendly park.