This trade deadline, barring any further significant injuries, I think we look at:
Bullpen: See how guys perform over the next month and see who settles into what roles. I think it's very possible we don't really need to add anybody, although most contenders add at least 1 guy, even if not a major move.
Rotation: Who do we pitch in a Game 3? Do you trust Gio in that role again? He's cost us 2 series so far by choking. Is it a flukey small sample size, or does he just not have the mental makeup for October? Maybe there is a vet out there with past postseason success that maybe during the season isn't a #3 ahead of Gio and Roark but might be a good postseason option?
Lineup: I think with Eaton and Murphy back, we're set. We can't play our best hitters at their ideal spot and need Harper (or Eaton) in CF, but that can't really be solved at the trade deadline. I also think Eaton/Murphy returning (and later Zimmerman) also takes care of our bench needs. I'd love to steal another Howie at the deadline, but I'm fine with Difo as the reserve middle infielder, Adams/Reynolds as 1B/LF bats, MAT as a 4th OF, and Goodwin as a 5th OF. Maybe if MW can't come back and perform we add a catcher?