Most of the post I find fairly exaggerated. The idea that Wright is such an epic offensive player, that you'd just as soon have the ball in Monta Ellis' hands as Rondo's, the bashing about Rondo being all about empty assists. I think Rondo is a clear upgrade for their starting lineup, and it remains to be seen how much the loss of Wright hurts them.
I concur - the article's confusion over "ball dominance" with USG kinda kills it's arguments. Ellis has had possession of the ball an average of 3.6 minutes per game this year. That's more than you'd see for a pure shooter SG (Klay Thompson, for example, averages 2.1 minutes), but no where near the ball dominance of a SG like Harden, who owns the ball some 6.3 minutes per game! Ellis has possession of the ball roughly 10% of the time when on the floor.
The majority (77%) of PG minutes in Dallas went to Nelson and Barea who, when on the floor, tended to have possession of the ball just under 18% of the time (a little lower for Nelson, a little higher for Barea).
So far this year, Rondo has averaged possession of the ball about 20% of the time when he is on the floor. So while that's slightly up from Nelson/Barea, that's hardly a dramatic difference.
EDIT: Just to add data from the one-game sample so far, Rondo possessed the ball just 4.5 minutes out of his 33.8 in his first game with Dallas, or a mere 13.3% of his floor time. Most likely that will change going forward.
The one argument I do like is that you shouldn't fix what isn't broken. The #1 offense in the leagues is something you usually don't want to mess with unless you're getting a huge defensive upgrade, but I doubt Rondo helps them very much defensively, as his D has obviously deteriorated over the years. Maybe he just needs a proper rim protector (formerly KG, now Tyson) to bail him out when his gambles don't pay. Or maybe even replacement-level D is a big upgrade-- was Nelson a sieve?
Rondo is a most definitely a huge defensive upgrade over Nelson. Nelson is wicked slow on defense these days. He moves as if his feet are weighted down with ankle weights.