With Parker, isn't all about the walks? Consistent K% > 25%, but BB% running at 15.4% last year and 11.3% this. Like to see the BB% below 10%. He's been doing that since his 6/30 start (211 batters faced, 17 BBs), while striking out 1/3 of batters (70)

5-1 over that stretch of 9 starts and 2 relief appearances. 4 HRs, 3.66 ERA, FIP 2.55. Can say a bit unlucky on contact (.375 BABIP) which is driving a WHIP of 1.28, but also a fly ball pitcher not giving up many HRs (probably due to Eastern League parks?).
Looking at some splits for the season, he seems to handle righties OK (relatively more GBs, lower HR%), and he also has had a knack for finishing innings when he gets 2 outs, judging off his WHIP in those situations.
Must be added to 40 man roster this year or exposed. I'd think as lefty with a consistent high K rate he might be somebody a team would grab a stash in the bullpen.