That's part of it, but that's also way too dismissive of it. Look a little deeper.
In every game that Adams was out, the WR's were accounting for less than half of the receptions (and sometimes barely any) in every game. Jones, Williams, and the TE's were getting most of the balls. Adams in the last three games has been targeted 11, 10, and 12 times.
In the Chargers game he was targeted 11 times and had 41 yards. In the 9'ers game, he was targeted 12 times, and had 43 yards. Rodgers clearly attempts to force him the ball, and it seems like it's detrimental to the offense. In two of those three games, they absolutely couldn't move the ball worth a crap.
Nobody else is getting targeted even 5 times per game, so yeah, it seems like Adams makes the offense somewhat one-dimensional.