Most importantly, read this:
A new "renegotiation and extension" provision allows an existing contract to be renegotiated so the player is paid a smaller amount over a longer period, but the player's salary cannot decrease by more than 40 percent. Renegotiations previously could only increase a player's salary.
BAM!, Amare, Melo and Chandler can all take huge pay decreases and extend for more years, allowing them to lower their salary for CP3!
Assuming MELO and Amare make 20 mil per, thats an 8 million dollar reduction they can each take next year, for Chandler, it would be a 6 million dollar reduction. Assuming they all take 30% less and extend for more years, thats an additional 16 or so million dollars we can offer cp3!