I think starter, corner/2B RHB and maybe reliever.
The secondary question is whether they go for pure rentals and primarily sell off pieces we need to dump for 40 man space anyway, or pursue more control and make some deals that really hurt.
Starter: I don't see the need for an expensive long term get here. Giolito comes back next year to replace Pivetta if he leaves, the other guys go into next season with more innings under their belts, and I think there's a very real chance we actually target Burnes this winter. So I think this is rental territory and we get
Yusei Kikuchi from TOR, who I think is quietly more impressive than top of the market guys like Flaherty and aligns better with our pitching program.
RHB: I love to fantasize about Isaac Paredes, I really do. One of the most ideal Fenway hitters in history, he'd be an absolutely perfect complement to Devers, Casas and Yoshida for the next three years. But realistically he's a starter and an all star and he'd cost all star starter prices, so I don't see Breslow splurging like that on a luxury utility role. I think this is ultimately rental territory again, as next year we're looking at a healthy Story and Grissom, with Mayer waiting in the wings and Romy having established himself as a capable utility guy. So to get us over the finish line I think we set our sights slightly to the right of Paredes and buy
Amed Rosario to upgrade Westbrook's bat. His defense is mediocre to godawful but you can plant him at a bunch of positions (not first, but Romy can take that), he's a contact singles/doubles guy (who somehow walks less than Ceddanne) and not remotely a power bat, but he doesn't have major splits and he's another burner so he'd fit right into the KAOS.
(Sidebar: if you wanted to split the difference you could continue across the Rays infield to Yandy Diaz, with 2 years of control and more of a power threat, but he comes with a big split and he's having a down year after two great ones. Maybe that makes Tampa want to get out of his $8m owed next year, I dunno.)
Reliever: this is murkier to me. Maybe pushing a starter to the pen and getting some combination of guys back from the IL is enough, but I have no idea what their progress looks like on that front. I think getting one more arm as insurance would still be prudent. Tanner Scott and Kirby Yates are both rentals with great stuff having excellent years, but both come with the closer tag and are going to be priced accordingly. One name I came across is
Nick Mears from COL. His underlying pitch metrics are really strong, though he walks too many guys. His numbers are really wild; the 5.95 ERA is over 3 runs higher than his 2.81 FIP, and naturally as a Rockies guy you wonder how much he's getting killed at home. The answer is none, his ERA at Coors is 3.57, and somehow he's managed a road ERA of 8.69, nearly SIX runs over his 2.96 FIP. He's only given up 2 HR in 42 innings so it's not that, he appears to be just super unlucky with a .378 BABIP (and he doesn't have an outlier hard hit rate or anything to fuel that). This is a lot of red for a waiver claim toiling in Colorado for major league minimum:
"Starer": where's my Koji SOON pic?