I mean, he still has a 3.45 SIERA and his other peripherals are great so he'll be fine.
Based on how they're pitching right now, that's how I'd line 'em up.
I think Giolito will be the guy from the last two years by the end of the season if he still has 96-97 in him, and I think he can still be very good even if he doesn't, if not quite ace level.
I'm not jumping off the wagon at all, but right now he's the Sox 3rd or 4th best starter, depending on how you view Kopech.