I'm not predicting greatness for SWR, far from it.
But when a guy pitches roughly a league-average rookie season while blowing through his innings record by over 30 innings, then follows it up by once again being roughly league-average the following season through six starts, one bad start doesn't change my opinion of him much.
At the very least, I give him more leash to see if he can work through it, especially in a rotation that is rock-solid. Letting one 24-year-old figure it out isn't going to kill the team.