He was most definitely part of the problem, unless you think a WR going rogue is not a problem.

There were and are many reasons for why the offense has underperformed and they have been clearly stated. It is not one thing or one person.

1. WRs not running the correct routes.
2. Receivers (TEs, WRs, RBs) not running the routes properly.
3. QB not delivering or setting up properly to deliver ball on time.
4. Injuries to O-line.
5. Injuries to starting RBs.
6. QB playing injured and not 100%. Effects mobility, pocket awareness, and throwing mechanics.
7. Play calling at times has been questionable.

It has been a team effort and it will take a team effort to correct.