Hendriks was a B grade prospect per Sickels circa 2011, reaching MLB at age 22, had comparisons to "prime" Kevin Slowey who had been a 2nd round draft pick. Hendriks certainly wasn't overpowering, but when I think "fringey" I imagine someone older or even less of a prospect. And it may have taken Hendriks five years to become a top closer, but it didn't take him nearly that long to find success in an MLB bullpen. Just one season removed from the Twins org, in his first action as a reliever, Hendriks posted a 1.5 fWAR relief season for Toronto in 2015, followed by a trade to Oakland and 1.4 and 1.0 fWAR years in their pen over 2016-2017. (Of course, he scuffled in 2018 and was available to the whole league on waivers before Oakland outrighted him to AAA for a few months, so it wasn't all smooth sailing!) Lesson there is, you probably should try a guy like that in the pen before casting him loose. And to our credit, we did that with Duffey more recently.