While I don't really support the trade, I don't think that the loss of Kearns and Lopez is the reason that the entire lineup has turned into one big out machine. They have done nothing in Washington yet to suggest that they would be carrying the offense here.
Narron is the one responsible. The lineups that he runs out are usually poorly consructed, and he continues to play the wrong players, leaving more deserving players on the bench. starting Clayton and Aurillia while Edwin and Deno when there are reasonable ways to get at least one of them in is hurting the offense.
While the line-up is obviously worse, the offense is not as bad as the last several games suggest.
It also doesn't help that Dunn and Griff are both slumping now. If they can starting hitting like they usually do, Clayton gets less PT, and if Narron starts putting the best possible starting line-up out there (the biggest if), they could still have an above average offense.
This wouldn't look bad at all (courtesy of RedsManRick i think):