Miguel Amaya got benched for a few days in early July to work on his swing. He came back on 7/7 and immediately started hitting. That mercifully removed an automatic out from the bottom of the Cubs order. Since that day, the Cubs are 3rd in wRC+ in baseball, and 2nd in runs per game at 5.4.
Now I don't think the Cubs walk into the offseason with the 2nd or 3rd best offense in baseball. There's a good bit of schedule and a good bit of batted ball luck to those second half numbers. However I do think Amaya (and PCA of course) righting the ship and fixing the bottom of the order unbroke the offense.
I would like to add offense to battle any inevitable regression, though I do think it's worth noting that Iowa has 5 top 100 hitter prospects collectively capable of covering every defensive position. Jed should address the position player group of course, but it doesn't *need* impact players. Impact players are always welcome, there should be enough resources this winter to add impact on both sides of the ball, but if paired with balling out on the pitching staff a co-starter at catcher and a better bench wouldn't be the worst outcome in the world on the position side.
The pitching staff though is kind of the opposite. It needs impact talent, and not really depth so much.
On the SP side Steele and Shota are great, but neither is a paragon of health, and as low velo pitchers are very prone to rapid drops in effectiveness even setting aside injury. Jameson Taillon is a boring league average starter. The young guys all have questions around health (Brown, Horton), ceiling (Assad, Wesneski, Birdsell), or both (Wicks). Adding a playoff caliber starter, even if he's not an ace, just radically changes the complexion of this group.
Similar story in the bullpen. Hodge is a GUY. There are a bunch of other guys who it's easy to like but hard to trust implicitly. Adding someone else in the Hodge tier, plus maybe a matchup lefty, would insulate the pen from a rough early season going while Hottovy sorts through those promising but unproven arms. Adding two impact arms would give us a pen that is lock down on day 1, and downright intimidating by June or July.