Another thing that needs to be mentioned here is that once the minute restrictions are lifted and Rondo starts playing regular rotations, he still needs to become better acquainted with the players he is playing with and where they like the ball and what they are most effective doing in certain plays and sets.
Rondo played with Green,Sully and Bradley before but only sparingly due to injuries of all four players. The rest of the team is all new to Rondo. he has to get familiar with them in a playing environment as well.
Rondo, judging from his lack of speed, burst, and lateral movement and just lack of desire to run full throttle on the break, is going to be a while getting back to being Rondo. March is the earliest I would expect it.
That said, Rondo doesn't have to be Rondo to be a major improvement at the PG position over what we had before his return.