My guess is Carlos takes Mayers pen spot and Weaver stays in the rotation. A DL trip could also open a roster spot for Carlos.
I’ll also guess we don’t see Wacha until rosters expand, when he can have one of the fifteen new spots.
While I’m guessing, i think the FO would like to see Luke tack on at least twenty IP from his all levels season total of ~135 in 17′.
As i mentioned before game time, there may be a weaver / ross piggyback in the works. Tonight we did see it.
This would allow management to stretch Luke to 155 to 165 IP, but also protect him from a poor outing, by quick hook, with Tyson waiting. I hope this what they are doing, because I want Luke as a SP now and next year, regardless of any W/L record.