Both issues are the responsibility of the Coach. It is his job to instill the discipline necessary to observe the fundamentals of the positions, such as tackling, who to watch, hip turns, and what your responsibilities are on each formation. Success or failure is measured by these basics, and it is evident that this season was a failure.
The mystifying thing is, there were games in which they did perform superbly. Followed by a game where they couldn't get out of their own way. This wild inconsistency is squarely placed upon the shoulders of the Coach. It is his responsibility.