This year, he has been better than the "middle." Yes, of course Martin is in a category above Wink, but Wink probably compares favorably to most team's #3 RP,er, so that's why I mentioned our top 3 RP'ers rank pretty highly, as do our top 2.
Some of Wink's numbers don't rank all that highly, but he has been an essential part of our pen and team success, this year. He is mid to higher leverage eating innings at a good pace.
If you add Pivetta as a RP'er and Crawford, you could probably go 4-5 deep and look pretty good, too.