I think Boyd is the one who needs to prove he can pitch well, before the end of the regular season. Since he came back from the IL on 6/25, he has the highest xERA (5.01), FIP (5.25) and xFIP (4.89) among our SP's. Yeah, he's worse than Peterson, Rea and Assad, and much worse than Holmes, Gausman and Shota (these guys have below 4.00 xERA and xFIP). Boyd's HR/9 is only .33 better than Shota (Gausman is slightly worse than Boyd.) In fact, both Boyd and Shota gave up 13 HR's since 6/25. The .33 difference in HR/9 looks big, if we're talking about 162 innings, but in the playoffs, they pitch only 4~5 innings a game. So, most likely, whoever makes bad pitches will give up more HR's.
Boyd's x stats just don't look good, and I have to think he's been lucky that his ERA is 3.45, since his return. His 4 seam hasn't looked very good, and his changeup command has been questionable lately. Obviously, that'd be great, if Boyd starts pitching much better in the next 3 weeks. He'll start tomorrow, and I really hope he'll pitch well.
Edit: the last four starts by Boyd and Shota, they have basically the same HR/9 (Shota 2.37 and Boyd 2.38), which don't look good. You should write an article about a backup plan for Boyd.
And, what sucks more is the Boyd's stats, 5.96 ERA, 5.44 xERA, 6.71 FIP, 5.20 xFIP in the last 4 starts. Because Boyd's arm should be in better shape than Shota (Shota pitched 50 innings more than Boyd this season), I was hoping Boyd would get better. I'm still hoping Boyd bounces back, but the time is running out.