I guess the leadership problem(er, crisis?)could really be the reason of what really ails this team lately. The baton of leadership should really be passed on to Rondo now. Sure, Pierce's production is important but he's so inconsistent and tends to pull the team to play slow and due to these the team suffers and loses focus.
The team must really run under Rondo's cue. The direction of the team play will heavily rely on him.