It makes sense that a guy like Gortat who clearly doesn't understand the importance of defense wouldn't realize that Rondo is way better than Nash because of his defense and rebounding.
I don't care what anyone says but Rondo is still not as good as Nash.
He has some fundamental flaws on offense that need serious work if he ever wants to be considered on Nash's level in 10 years time.
Nash's defense is weak but he is one of the greatest point guards of all time- some would argue the greatest offensive point guard of all time.
Gortat is a defensively orientated player aswell.
He has been in the media ever since joining the suns complaining about the suns lack of defensive structure and how it needs to improve. He continually states the importance of defense in interviews. I really don't know how you came to the assertion that he has no idea about defense.
Don't let the green light blind you.
Ask yourself honestly if about Nash vs Rondo...
Rondo still has a good 10 years left in him to become the greatest PG of all time but right now Nash is way ahead of him.