I do think Rondo "padded stats" to a degree. Those wide open shots he would pass up to thread a pass to someone were not intended to make the other player better or help the team win. They were because missing shots was in his head and he preferred from a personal perspective to get an assist added to his stats over a missed shot.
This is basically all in your head though. You don't have any real idea whether it's true or not, and you have to ignore the much more likely explanation (Rondo knows enough about basketball to realize that a made basket (even one that comes from a pass) helps the team more than a missed shot does). It's fairly interesting the number of contrived reasons you see here that are meant to put Rondo in a bad light for doing what anyone would tell you is the correct basketball play. The number of people that buy into that nonsense because they read it on the internet is probably more interesting though.
BballTim is correct, I don't "know" what Rondo is thinking but it is my opinion and what is in my head is there based on what I see on the court. Clearly BballTim does not give much credence to my observations but I can get over that.
Sometimes you make a pass that is not necessary to reward a big man for running. Sometimes it could make sense to get a player going out of a slump by giving him an easy basket even though you had a layup yourself. So there are times when passing for the sake of passing can be strategic.
In Rondo's case, there were times (and a lot this season) where it seemed to me that he was passing just to get an assist or to avoid shooting himself. Passing up a really good shot, wide open usually, for what was not necessarily a better shot. At times it seemed he did this because he was afraid to shoot, other times it seemed like he was doing it to "pad" his assists. (Along the way, Rondo made plenty of really good passes too of course).
He does not seem to be doing the unnecessary passing so far in Dallas and certainly didn't do it last night (although I did not see the whole game). His new team's results are better for it as would have the Celtic's results have.