The 'championship formula':
1) good to great defense centered around a dominating (defensively) post presence, coupled with at least an adequate-sized partner (6'10ish and up) who is not a defensive liability, or is a defensive plus in his own right.
2) Elite leadership from at least 2 or 3 proven respected veteran starters.
3) Player who can create his own shot out of thin air if needed, who is an emotional leader, and one of if not the most talented guy on the team.
4) Top 10 (positionally) players at 3 of the 5 starting positions, with a deep bench.
Right now, Rondo can be part of the leaders on a team, but not an elite one, he can be part of the top 10 positional players, and he can be a part of a good to great defense, but he can't create his own shot out of thin air on an elite level, and he can't be that defensively dominating big man (obviously).
He needs to develop his jumper and be most emotionally consistent as a leader.