I thought Lowe's article was relatively objective and insightful.
With their current team, Dallas was a long-shot to win the chip - they were a second tier West team, behind GS, LAC, MEM, HOUS, even OKC. Their weakest leak was at point. While Rondo has his weaknesses, he was and is a much better option than anything they had. The risk is that Rondo adds little to their offense, or even worse makes them even less effective. On defense he'll be a plus. This may - or may not - work out for the Mavs, i.e. it's not the home-run some think it is.
My guess is one of Danny's unstated goals is not to commit to large salaries, ala Pat Riley's current thinking, beyond 2016, unless that player is an obvious max-type star player. Rondo is not such a player, nor is Jeff Green, which makes me think this is his last year with us, as he'll likely get offers at or close to the max. I think Rondo would likely have stayed with Boston if they had offered market level compensation; I don't think Boston wanted to commit that money/years to him.
As always, time will tell....time being measured in years, not months. I miss Rondo as much as anyone, but still a fan of the guys in green.