Ehhh, I don't know man...
I love Rondo. Watching him play meaningful basketball again would be fun and in theory, someone of his caliber and talent, would and should make the fit work in Dallas. Despite, the shortcomings that Rondo has offensively.
That being said, fit and chemistry are delicate. The Mavericks have the best offense in the league for a reason. Will Rondo's lack of shooting have an effect on Dirk and Monta? While Rondo surely is an upgrade over anyone that the mavs currently have at the lead guard position, is he a better fit is the question and I honestly do not know. He obviously helps out tremendously on the other side of the ball, but Brandan Wright helped on that end too.
I would probably pull the trigger on rondo because i'm that high on him, but IDK man. I would have to see how this actually works if and when this deal goes through.