I think Berger was wrong about Rondo's extension.
He could sign an extension this summer for 3 years (4 including the year he is already under contract for). The downside is you can only give him 7.5% raises from his 2014-15 salary. BUT, they can also give him a 15% bonus of the entire extension, that would be paid either on July 1, 2015...or if they are under the cap this summer (unlikely, but possible), it could be paid immediately.
What this all means is this summer, Rondo could sign a 3 year/$44.5 million extension, plus a 6.68 million signing bonus. Which would make it 3 years/$51.2 million, making an average of just over $17 million per year...with the added value money value of receiving $6.68 million in a lump sum signing bonus at the beginning of the contract.
While he could certainly have the potential to make more money by waiting, hitting free agency, and hoping to max out, he would be taking significant risk that he would stay healthy, and improve enough to get paid that much next year.
Plus, both he and the C's might prefer the flexibility of the slightly shorter contract. For the C's, it is obvious why, but for Rondo, it also means that there is more of a chance that he will sign one more big money contract before he falls off a cliff when he starts getting deeper into his 30's.
So, I think it is very possible that he will agree to an extension this summer, and they will go forward with Rondo locked up through 2018.