More coulda woulda shoulda here.
I mean, if we really want to be fair about Harris's deadline performance last year—I know I do—let's take a look at all seven guys he picked up at the deadline, by fWAR:
Finnegan: +0.7
Morton: 0.0
R. Montero: 0.0
Sewald: -0.1
Heuer: -0.1
Paddack: -0.5
Dobnak: n/a
Total: 0.0
So, going by this measure, meaning contributions to wins and losses, Harris's performance was a wash.
Sure, folks can hammer Harris now for not getting a basket of guys who netted out to a high positive WAR, and folks will. And folks can hammer him some more for getting six guys who did not achieve positive WAR and only one guy who did, and folks will. But I wouldn't agree that Harris's pickups were a collective disaster, because by this measure, they didn't lose us any more games than freely available options in house would have, theorietically.
I also wouldn't say that the pickups Harris made was the sole reason we collapsed, especially considering that the same group of hitters who slashed .252/.322.430/108 wRC+ in the first 36 games after the deadline then went on to "hit" .210/.282/.326/70 wRC+ during the final 16-game skid.