I give the Twins creativity points for the draft-college-reliever, develop-into-starter strategy. Duffey is about the only return so far, but its too early to judge it one way or another. Watching Liam Hendriks hit 98 in Toronto the other day, I do with they were better at identifying when starters should be converted (back) into relievers before they cut bait and lose them for nothing.
For a short-term strategy, trade seems like the best strategy to me. A guy like Carlos Carrasco looks like a decent bet to have a breakout, ace caliber year and is rumored to be on the trading block. Or someone who they think has the stuff but has been miscast in a bullpen role or just hasn't put it all together for a full season yet.