If you're not crazy about seeing Stock, here are a couple of guys who might be here if not for him:
Jonah Tong has picked things up as of late in Syracuse. He has a 2.39 ERA in the month of August, and that includes his stinker on August 5 where he gave up 5 HR in 5 IP. In his last 4 starts, he's pitched 21.1 innings, and given up 2 ER. That will play. I wouldn't be shocked if Jonah gets the call the next time through, but maybe the Mets want him to finish the season strong in AAA.
Tobias Myers seems to be getting it back too. 2.89 ERA in August. In his last 5 appearances, he's pitched 12.1 innings, with 2 ER. Looks like he's been used as a reliever, so not really a starting option.
Jack Wenninger probably needs more time. 5.00 ERA in August, though his WHIP is down to 1.06. That follows a 4.91 ERA, 1.58 WHIP in July. So yeah, not ready.
Jonathan Santucci has a 7.58 ERA and 2.00 WHIP ion 5 starts at AAA. Not a realistic option.
Not a starter, but Dylan Ross is unscored upon in his last 6 outings (6.2 IP).