That's a bit of an exaggeration. Kidd is servicable, and any shots he takes would be WIDE OPEN. I'm not even going to comment at saying Kobe is not a factor in the perimeter game. KG and TD's range both extend to a reliable 17 feet.
Defensively, they match up terribly for the rooks. They are coming around on perimeter defense and transition defense. They can't defend Tim Duncan, Kevin Garnett and Shaq. There is no evidence that any of the five rooks(I'm not touching this second team madness) can defend in the post, and Kobe Bryant can score very well against all but the very greatest of defenses, so I don't see how offense is a problem.
Speaking of perimeter play...sink into a zone on that rookie team and watch what happens, especially with the length and defensive IQ of the 1st team. We are talking about a huge disparity in defense here. You don't even have the personnel to run a pick and roll against the 1st team, because KG is there as one of the all time great versatile defenders. If you penetrate, Shaq, Duncan and KG are extremely hard to finish against, and Kobe is no slouch on weak side help, plus Kidd is going to still strip people(STILL avg 2.5 steals per).
The Rooks would never know what a transition game was like.