Interesting to hear. I love that approach and I'm surprised more ML pitchers (especially ones with control problems) don't utilize it. I made the switch personally about 3 years ago and now only pitch out of the stretch and I love it.
Here are the stats/report for anyone who's curious
Glasnow, who has compiled a 7-0 record with a 1.57 ERA, 0.99 WHIP and 103:26 K:BB in 68.2 Triple-A innings since a demotion to the minors, has pitched exclusively out of the stretch for Indianapolis, Pirates Prospects reports. (8/13/2017)